Geometry Triangles & Congruence 5

Question 1

An altitude of a triangle is a segment from a vertex that is:

Accepted Answer

Perpendicular to the opposite side

Answer

An altitude is perpendicular to the opposite side (or its extension).

Question 2

If triangle ABC is congruent to triangle XYZ and angle B = 40 degrees, then angle Y equals:

Accepted Answer

40 degrees

Answer

Corresponding angles of congruent triangles are equal, so angle Y = 40 degrees.

Question 3

A triangle with all sides of different lengths is called:

Accepted Answer

Scalene

Answer

A scalene triangle has three sides of different lengths.

Question 4

Which point is the intersection of a triangle's three medians?

Accepted Answer

Centroid

Answer

The three medians meet at the centroid, the triangle's balance point.

Question 5

Two triangles cannot be proven congruent by which listed condition?

Accepted Answer

AAA

Answer

AAA only guarantees similarity, not congruence, since size can differ.

Geometry Practice Test