Isosceles and Equilateral Triangles

Front

What are the properties of an equilateral triangle?

Back

All sides are equal in length, and all angles measure 60°.

Front

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

Back

The angles opposite the congruent sides are also congruent.

Front

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

Back

The sum of the interior angles of a triangle is 180°.

Front

How do you calculate the sum of the interior angles of a polygon?

Back

The sum of the interior angles of a polygon with n sides is (n-2) × 180°.

Front

What is the sum of the angle measures in a hexagon?

Back

720°.

Front

In an isosceles triangle, what is true about the base angles?

Back

The base angles are congruent.

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 a triangle?

Back

A polygon with three edges and three vertices.

Front

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

Back

Each of the other two angles measures 70°.

Front

What is the relationship between the sides and angles in a triangle?

Back

In a triangle, larger angles are opposite longer sides.