ABC is a triangle. What is the median of the triangle? A A A B B B C C C E E E F F F D D D

There is no median in the figure.

The sides or edges of a triangle

The sides of a triangle

Every triangle has three sides. That also works the other way around - if we see a shape with tree sides, it's a triangle.

types of triangles based on the sides:

The sides allow us to classify the different types of triangles according to their size:

Equilateral: All sides are equal, leading to equal angles.
Isosceles: Two sides are equal, with base angles also equal.
Scalene: All sides are different lengths, with all angles unique.

Perimeter of a Triangle

Like every polygon, the sides of a triangle form its perimeter. To find the perimeter of a triangle, simply add the lengths of all three sides.

Relation between the sides and the angles in a triangle

In a triangle, there’s a direct relationship between the length of a side and the size of the angle across from it:
The Longer Side will always be in the opposite side of the larger Angle, and the shorter side will always be in the opposite side of the smaller Angle.

Can every three lines form a triangle?

In any triangle, the sum of the two shorter sides must always be greater than the length of the third side. This rule, known as the Triangle Inequality Theorem, ensures that the sides can actually form a closed triangle. For example, if the two shorter sides are not greater than the third, the sides would lie flat rather than forming a triangle. This principle is crucial in determining whether a set of side lengths can create a valid triangle.

Detailed explanation

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Test yourself on parts of a triangle!

True or false:

DE not a side in any of the triangles.

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Perimeter of the triangle

Recall that the perimeter of a plane figure is its edge, so in a triangle the perimeter is the sum of its three sides (edges).

A condition satisfied by the measures of the sides (or edges) of a triangle.

In any triangle the sum of the length of any two of its sides must be greater than the length of the third side.

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Test your knowledge

Question 1

Is DE side in one of the triangles?

Question 2

The triangle ABC is shown below.

To which side(s) are the median and the altitude drawn?

Question 3

The triangle ABC is shown below.

Which line segment is the median?

Examples of the subject

Example 1

Given a triangle with sides $4~cm$ , $3~cm$ and $5~cm$ . Calculate the perimeter.

Solution

We know that the perimeter of a triangle is the sum of its three sides, therefore,

$P=4\operatorname{cm}+3\operatorname{cm}+5\operatorname{cm}$

Answer:

$P=12\operatorname{cm}$

Example 2

Tell if it is possible to construct a triangle in which its sides measure $3~cm$ , $4~cm$ and $8~cm$ .

Solution

Recall that in order to construct a triangle, the sum of any two sides must be greater than the third side.

If we add the sides with measures $3~cm$ and $4~cm$ , we get as a result $7~cm$ , which is less than the third side.

Answer:

Therefore, it is not possible to construct a triangle with the given measures.

Do you know what the answer is?

Question 1

Look at triangle ABC below.

What is the median of the triangle and to which side is it drawn?

Question 2

Look at triangle ABC below.

Which is the median?

Question 3

Look at the triangle ABC below.

$AD=\frac{1}{2}AB$

$BE=\frac{1}{2}EC$

What is the median in the triangle?

Example 3

If an equilateral triangle has perimeter $P=21\operatorname{cm}$ . How long is each side?

Solution

Since the triangle is equilateral we know that its sides are equal, so we just divide the perimeter by three to get the measure of each side. lado.

$P=3x$

$21\operatorname{cm}=3x$

$x=21\operatorname{cm}:3$

Answer:

$x=7\operatorname{cm}$

Example 4

Tell if it is possible to construct a triangle in which its sides measure $5~cm$ , $7~cm$ and $10~cm$ .

Solution

We add the lengths of any two sides (edges) and compare with the length of the remaining side.

$5~cm + 7~cm= 12~cm$ which is greater than the remaining side that measures $10~cm$
$7~cm + 10~cm = 17~cm$ The length of the remaining side, which is greater than the remaining side measuring $5~cm$ , is greater than the remaining side measuring $5~cm$ .
$10~cm + 5~cm = 15~cm$ , which is greater than the remaining side measuring $7~cm$ .

Answer:

So if it is possible to construct a triangle of measures $5~cm$ , $7~cm$ and $10~cm$ on each side.

Check your understanding

Question 1

ABC is a triangle.

What is the median of the triangle?

Question 2

Look at the triangles in the figure.

Which line is the median of triangle ABC?

Question 3

What is the median of triangle ABC?

Questions on the subject

How many sides does a triangle have?

A triangle has three sides.

How many edges does a triangle have?

A triangle has three edges.

What are the edges of a triangle?

The edges of a triangle, commonly called the sides of a triangle, are the straight lines that bound the faces of the triangle.

What are the edges of a figure?

In a plane figure, the edges or sides are the line segments that join two vertices, and form the outline or perimeter of the figure.

Exercises on the sides or edges of a triangle

Exercise 1

Query

$DE$ Does that side not exist as part of any of the triangles?

Consignment DE This side does not exist as part of any of the triangles.

Solution

A side in a triangle is a line that passes between one of the 3 points that are the angles of the triangle.

In this case the line $DE$ does not pass between the extreme angles of any of the triangles but goes out through a point $D$ which is in fact an angle in a triangle $\triangle DBC$ but $DE$ ends at the point $E$ which is not an angle in any of the triangles in the figure.

Answer

True

Do you think you will be able to solve it?

Question 1

What is the median of triangle ABC.

Question 2

Look at the triangle ABC below.

Which of the following lines is the median of the triangle?

Question 3

Look at the triangle ABC below.

Which of the line segments is the median?

Exercise 2

Question:

Do the triangles in the drawing overlap?

Solution

We can observe that according to the theorem of superposition: side, side, angle.

We can observe that there are 2 sides equal in length and an angle equal in size.

Answer

Yes

Exercise 3

Question

What type of triangle is drawn here?

Solution

It can be seen that in this triangle each of its three angles is of different size so it can be said that it is a scalene triangle.

Answer

Scalene triangle

Test your knowledge

Question 1

True or false:

AB is a side of the triangle ABC.

Question 2

True or false:

AD is a side of triangle ABC.

Question 3

True or false:

DE not a side in any of the triangles.

Exercise 4

Consigna

Given the following triangle:

The perimeter of the triangle is $17$

How much is $X$ ?

Solution

To solve the task we replace all the data we have in the equation to calculate the perimeter of the triangle:

$2X+3X+3.5X=17$

Let's remember... The perimeter of the triangle is equal to the sum of its 3 sides.

If we calculate the equation we find that:

$8.5X=17$

We divide the equation by $8.5$ to find the value of. $X$

$\frac{8.5X}{8.5}=X=\frac{17}{8.5}=2$

Answer

$2$

Exercise 5

Request

Given the equilateral triangle

The perimeter of the triangle is $33\operatorname{cm}$ , what is the value of $X$ ?

Solution

One of the characteristics of an equilateral triangle is obviously that each of its sides are equal, i.e. if one side is worth $11$ all its sides will be equal to $11$

Answer

$11$

Do you know what the answer is?

Question 1

Is DE side in one of the triangles?

Question 2

The triangle ABC is shown below.

To which side(s) are the median and the altitude drawn?

Question 3

The triangle ABC is shown below.

Which line segment is the median?

Examples with solutions for The sides or edges of a triangle

Exercise #1

True or false:

DE not a side in any of the triangles.

Video Solution

Step-by-Step Solution

To solve the problem of determining whether DE is not a side in any of the triangles, we will methodically identify the triangles present in the diagram and examine their sides:

Identify triangles in the diagram. The diagram presented forms a right-angled triangle ABC with additional lines forming smaller triangles within.
Triangles formed: Triangle ABC (major triangle), Triangle ABD, Triangle BEC, and Triangle DBE.
Let's examine the sides of these triangles:

Triangle ABC has sides AB, BC, and CA.
Triangle ABD has sides AB, BD, and DA.
Triangle BEC has sides BE, EC, and CB.
Triangle DBE has sides DB, BE, and ED.

Notice that while point D is used, the segment DE is only part of line BE and isn't listed as a direct side of any triangle.

Therefore, the claim that DE is not a side in any of the triangles is indeed correct.

Hence, the answer is True.

Answer

True

Exercise #2

Is DE side in one of the triangles?

Video Solution

Step-by-Step Solution

Since line segment DE does not correspond to a full side of any of the triangles present within the given geometry, we conclude that the statement “DE is a side in one of the triangles” is Not true.

Answer

Not true

Exercise #3

The triangle ABC is shown below.

To which side(s) are the median and the altitude drawn?

Step-by-Step Solution

To solve the problem of identifying to which side of triangle $ABC$ the median and the altitude are drawn, let's analyze the diagram given for triangle $ABC$ .

We acknowledge that a median is a line segment drawn from a vertex to the midpoint of the opposite side. An altitude is a line segment drawn from a vertex perpendicular to the opposite side.
Upon reviewing the diagram of triangle $ABC$ , line segment $AD$ is a reference term. It appears to meet point $C$ in the middle, suggesting it's a median, but it also forms right angles suggesting it is an altitude.
Given the placement and orientation of $AD$ , it is perpendicular to line $BC$ (the opposite base for the median from $A$ ). Therefore, this line is both the median and the altitude to side $BC$ .

Thus, the side to which both the median and the altitude are drawn is BC.

Therefore, the correct answer to the problem is the side $BC$ , corresponding with choice $\text{Option 2: BC}$ .

Answer

Exercise #4

The triangle ABC is shown below.

Which line segment is the median?

Video Solution

Step-by-Step Solution

To solve this problem, we need to identify the median in triangle ABC:

Step 1: Recall the definition of a median. A median is a line segment drawn from a vertex to the midpoint of the opposite side.
Step 2: Begin by evaluating each line segment based on the definition.
Step 3: Identify points on triangle ABC:

AD is from A to a point on BC.
BE is from B to a point on AC.
FC is from F to a point on AB.

Step 4: Determine if these points (D, E, F) are midpoints:

Since BE connects B to E, and E is indicated to be the midpoint of segment AC (as shown), BE is the median.
AD and FC, by visual inspection, do not connect to midpoints on BC or AB respectively.

Therefore, the line segment that represents the median is $BE$ .

Thus, the correct answer is: BE

Answer

Exercise #5

Look at triangle ABC below.

What is the median of the triangle and to which side is it drawn?

Step-by-Step Solution

A median of a triangle is a line segment that connects a vertex to the midpoint of the opposite side. In triangle $\triangle ABC$ , we need to identify such a median from the diagram provided.

Step 1: Observe the diagram to identify the midpoint of each side.

Step 2: It is given that point $E$ is located on side $AC$ . If $E$ is the midpoint of $AC$ , then any line from a vertex to point $E$ would be a median.

Step 3: Check line segment $BE$ . This line runs from vertex $B$ to point $E$ .

Step 4: Since $E$ is labeled as the midpoint of $AC$ , line $BE$ is the median of $\triangle ABC$ drawn to side $AC$ .

Therefore, the median of the triangle is $BE$ for $AC$ .

Answer

BE for AC

Start practice

The sides or edges of a triangle

The sides of a triangle

types of triangles based on the sides:

Perimeter of a Triangle

Relation between the sides and the angles in a triangle

Can every three lines form a triangle?

Test yourself on parts of a triangle!

Perimeter of the triangle

A condition satisfied by the measures of the sides (or edges) of a triangle.

Examples of the subject

Example 1

Example 2

Example 3

Example 4

Questions on the subject

Exercises on the sides or edges of a triangle

Exercise 1

Exercise 2

Exercise 3

Exercise 4

Exercise 5

Examples with solutions for The sides or edges of a triangle

Exercise #1

Video Solution

Step-by-Step Solution

Answer

Exercise #2

Video Solution

Step-by-Step Solution

Answer

Exercise #3

Step-by-Step Solution

Answer

Exercise #4

Video Solution

Step-by-Step Solution

Answer

Exercise #5

Step-by-Step Solution

Answer

More Questions

Parts of a Triangle