**The plane angle is the one that measures** **$180°$****.**

**Plane angle**

Which of the 4 angles shown in the figure corresponds to the description of the plane angle?

**The correct answer is C) 180 °**

**The plane angle is the one that measures** **$180°$****.**

Which of the 4 angles shown in the figure corresponds to the description of the plane angle?

**The correct answer is C) 180 °**

Choose the appropriate triangle according to the following:

Angle B equals 90 degrees.

**If you are interested in learning more about other angle topics, you can enter one of the following articles:**

- Angle Notation
- Sides, Vertices, and Angles
- Bisector
- Right Angle
- Adjacent Angles
- Vertically Opposite Angles
- Alternate Angles
- Corresponding Angles
- Sum of the Angles of a Triangle
- Sum of the Angles of a Polygon
- Sum and Difference of Angles

**On the website of** **Tutorela**** you will find a variety of articles on mathematics.**

Choose the appropriate triangle according to the following:

Angle B equals 90 degrees.

Let's note in which of the triangles angle B forms a right angle, meaning an angle of 90 degrees.

In answers C+D, we can see that angle B is smaller than 90 degrees.

In answer A, it is equal to 90 degrees.

If the two adjacent angles are not equal to each other, then one of them is obtuse and the other acute.

The answer is correct because the sum of two acute angles will be less than 180 degrees and the sum of two obtuse angles will be greater than 180 degrees

True

True or false?

One of the angles in a rectangle may be an acute angle.

One of the properties of a rectangle is that all its angles are right angles.

Therefore, it is not possible for an angle to be acute, that is, less than 90 degrees.

False

True or false?

An acute angle is smaller than a right angle.

The definition of an acute angle is an angle that is smaller than 90 degrees.

Since an angle that equals 90 degrees is a right angle, the answer is correct.

True

Which figure depicts a right angle?

A right angle is equal to 90 degrees. In diagrams A+C, we see that the angle symbol is a symbol representing an angle that equals 90 degrees.

Test your knowledge

Question 1

Does the drawing show an adjacent angle?

Question 2

Does the drawing show an adjacent angle?

Question 3

Does the drawing show an adjacent angle?

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