Angles in Triangles

Front

What is the name of a triangle with two equal sides?

Back

Isosceles triangle

Front

What is the sum of all angles in a triangle?

Back

180°

Front

What do you call an angle that measures exactly 90 degrees?

Back

Right angle

Front

In triangle ABC, which angle is the vertex angle if AB = AC?

Back

Angle C

Front

What is the name of a triangle with all sides of different lengths?

Back

Scalene triangle

Front

What is the name of a triangle with all angles less than 90 degrees?

Back

Acute triangle

Front

What is the relationship between the angles in a right triangle?

Back

One angle is 90 degrees, and the sum of the other two angles is 90 degrees.

Front

What is the formula to find the measure of an exterior angle of a triangle?

Back

The exterior angle is equal to the sum of the two opposite interior angles.

Front

What is the name of a triangle with one angle greater than 90 degrees?

Back

Obtuse triangle

Front

How do you find the measure of an unknown angle in a triangle?

Back

Subtract the sum of the known angles from 180°.