Isosceles & Equilateral Triangles

Front

What is the measure of each angle in an equilateral triangle?

Back

60 degrees

Front

If two sides of a triangle are congruent, what can be said about the angles opposite those sides?

Back

The angles opposite those sides are congruent.

Front

What is the vertex angle in an isosceles triangle?

Back

The angle formed by the two congruent sides.

Front

In an equilateral triangle, what is the sum of all angles?

Back

180 degrees.

Front

If one angle of an isosceles triangle is 40 degrees, what are the measures of the other two angles?

Back

70 degrees each.

Front

What is the definition of an isosceles triangle?

Back

A triangle with at least two sides of equal length.

Front

What is the definition of an equilateral triangle?

Back

A triangle with all three sides of equal length.

Front

If the base angles of an isosceles triangle are each 50 degrees, what is the measure of the vertex angle?

Back

80 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 relationship between the sides and angles in a triangle?

Back

The larger the side, the larger the opposite angle.