Equilateral and Isosceles Triangle

Front

What is an equilateral triangle?

Back

A triangle with all three sides of equal length and all three angles equal to 60 degrees.

Front

What is an isosceles triangle?

Back

A triangle with at least two sides of equal length and the angles opposite those sides are also equal.

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

It is an isosceles triangle.

Front

What is the formula for finding the area of a triangle?

Back

Area = 1/2 * base * height.

Front

In an equilateral triangle, what is the measure of each angle?

Back

Each angle measures 60 degrees.

Front

What is the relationship between the sides and angles in an isosceles triangle?

Back

The angles opposite the equal sides are equal.

Front

How do you determine if a triangle is equilateral?

Back

All three sides must be of equal length.

Front

What is the base of a triangle?

Back

The side of the triangle on which the triangle is considered to be standing.

Front

If the base of an isosceles triangle is 10 cm and the equal sides are 7 cm, can this triangle exist?

Back

No, because the sum of the lengths of the two equal sides must be greater than the base.