Verify if AD is the Height in Triangle ABC: Geometric Properties Analysis

Triangle Heights with Perpendicular Line Verification

Determine whether the statement is true or false.

AD is the height in the triangle ABC.

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Determine whether AD is the height in the triangle
00:03 AD is the perpendicular according to the given information( it creates a right angle with the side)
00:08 A perpendicular in a triangle is the height
00:11 This is the solution

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

Determine whether the statement is true or false.

AD is the height in the triangle ABC.

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2

Step-by-step solution

To determine if AD is the height of triangle ABC, we start by recalling the definition of a height in a triangle. A height is a perpendicular line segment from a vertex to the line containing the opposite side. In triangle geometry, for AD to be considered a height, it must be perpendicular to the line BC.

The given diagram shows that AD is indeed perpendicular to BC, as denoted by the perpendicular symbol (the small square at the intersection indicating a 9090^\circ angle). This matches the definition of a height in a triangle, which is a line drawn perpendicular from a vertex (in this case, vertex A) to the line containing the opposite side (here, BC).

Since AD meets this criterion of being perpendicular to the opposite side, we can conclusively state that AD is indeed the height of the triangle ABC. Thus, the statement "AD is the height in the triangle ABC" is true.

Therefore, the solution to the problem is True.

3

Final Answer

True.

Key Points to Remember

Essential concepts to master this topic
  • Definition: Height is perpendicular from vertex to opposite side
  • Visual Check: Look for right angle symbol (small square) at intersection
  • Verification: Confirm AD forms 9090^\circ angle with BC at point D ✓

Common Mistakes

Avoid these frequent errors
  • Confusing height with any line from vertex
    Don't assume any line from vertex A to side BC is a height = wrong identification! A height must be perpendicular to the opposite side. Always look for the right angle symbol or verify the 90° angle.

Practice Quiz

Test your knowledge with interactive questions

Is DE side in one of the triangles?
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FAQ

Everything you need to know about this question

How do I know if a line is really perpendicular?

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Look for the right angle symbol (small square) where the lines meet. In diagrams, this symbol specifically indicates a 9090^\circ angle, confirming perpendicularity.

Can a triangle have more than one height?

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Yes! Every triangle has three heights - one from each vertex to the opposite side. Each height creates a right angle with its corresponding base.

What's the difference between height and altitude?

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They're the same thing! Height and altitude both refer to the perpendicular distance from a vertex to the opposite side. Both terms are used interchangeably in geometry.

Does the height always fall inside the triangle?

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Not always! In acute triangles, all heights are inside. But in obtuse triangles, some heights fall outside the triangle and meet the extended opposite side.

Why is perpendicularity so important for heights?

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The height represents the shortest distance from a vertex to the opposite side. Only a perpendicular line gives this minimum distance - any other line would be longer!

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