Triangle ABC: Identifying the Side with Coinciding Median and Height

Triangle Properties with Coinciding Median and Height

Which side of triangle ABC is both the median and the height drawn to?

CCCAAABBBDDDEEEFFF

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Determine which side the median and the height are drawn to in the following triangle
00:03 CE bisects AB
00:10 AC is perpendicular to AB (forming a right angle)
00:18 This is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Which side of triangle ABC is both the median and the height drawn to?

CCCAAABBBDDDEEEFFF

2

Step-by-step solution

To solve this problem, we need to use the properties of medians and heights, specifically in isosceles triangles. In an isosceles triangle, the median from the vertex angle to the base is also the height. In the diagram of triangle ABC, given the problem context and a typical configuration of an isosceles triangle, we can see that:

  • The side AB is horizontally aligned in the diagram.
  • The point D, directly below A, suggests that the median from A also serves as the height to the base BC, if AB = BC making triangle ABC isosceles.

Therefore, in triangle ABC, side AB is both the median and the height of the triangle, assuming a vertical symmetry along median AD, characteristic of an isosceles triangle configuration.

Therefore, the correct answer is AB AB .

3

Final Answer

AB

Key Points to Remember

Essential concepts to master this topic
  • Key Property: In isosceles triangles, median from vertex angle equals height
  • Technique: Identify the perpendicular line from vertex to opposite side
  • Check: Verify the line bisects the base and forms 90° angle ✓

Common Mistakes

Avoid these frequent errors
  • Confusing which side the median and height are drawn TO versus FROM
    Don't identify the side the line comes FROM as your answer = wrong side! The question asks which side the median/height is drawn TO (the base). Always identify the side that the perpendicular line meets, not the vertex it starts from.

Practice Quiz

Test your knowledge with interactive questions

Is the straight line in the figure the height of the triangle?

FAQ

Everything you need to know about this question

What's the difference between a median and a height?

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A median connects a vertex to the midpoint of the opposite side. A height is perpendicular from a vertex to the opposite side. In isosceles triangles, these can be the same line!

How can I tell if a triangle is isosceles from the diagram?

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Look for visual symmetry - if the triangle appears to have two equal sides or a vertical line of symmetry, it's likely isosceles. The perpendicular from the vertex angle will bisect the base.

Why does the median equal the height only in isosceles triangles?

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In an isosceles triangle, the vertex angle sits directly above the midpoint of the base. So the line from vertex to midpoint is automatically perpendicular, making it both median and height!

What if the triangle isn't isosceles?

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In a general triangle, the median and height from any vertex are different lines. They only coincide in isosceles triangles when drawn from the vertex angle to the base.

How do I identify which side is the base in the diagram?

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  • Look for the horizontal side at the bottom
  • Find the side that the perpendicular line meets
  • It's usually the side opposite to the vertex with equal sides

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