4.1-4.2 Triangle Sum, Isosceles, Equilateral

Front

What is the sum of the interior angles in a triangle?

Back

180 degrees.

Front

What is an isosceles triangle?

Back

A triangle with at least two equal sides.

Front

What is an equilateral triangle?

Back

A triangle with all three sides equal and all angles measuring 60 degrees.

Front

If one angle of a triangle measures 50 degrees and another measures 60 degrees, what is the measure of the third angle?

Back

70 degrees.

Front

What is the vertex angle in an isosceles triangle?

Back

The angle opposite the base, which is the angle formed by the two equal sides.

Front

In triangle ABC, if angle A = 30 degrees and angle B = 60 degrees, what is angle C?

Back

90 degrees.

Front

What is the relationship between the angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

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

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the base of an isosceles triangle?

Back

The side opposite the vertex angle.

Front

If two angles of a triangle are equal, what type of triangle is it?

Back

It is an isosceles triangle.