Isosceles and Equilateral Triangles

Front

What is an isosceles triangle?

Back

A triangle with at least two sides of equal length.

Front

What is an equilateral triangle?

Back

A triangle with all three sides of equal length.

Front

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

Back

180 degrees.

Front

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

Back

Isosceles triangle.

Front

What is the base of an isosceles triangle?

Back

The side that is not equal in length to the other two sides.

Front

How do you find the missing angle in a triangle?

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the relationship between the angles in an equilateral triangle?

Back

All angles are equal and measure 60 degrees.

Front

If one angle of an isosceles triangle is 50 degrees, what are the other two angles?

Back

Both angles are 65 degrees.

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height.

Front

How can you determine if a triangle is equilateral?

Back

All three sides must be of equal length.