Equilateral and Isosceles Triangle

Front

What is an equilateral triangle?

Back

A triangle where all three sides are of equal length and all three angles measure 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 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

Isosceles triangle.

Front

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

Back

60 degrees.

Front

How do you find the height of an equilateral triangle?

Back

Use the formula: height = (sqrt(3)/2) * side length.

Front

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

Back

The angles opposite the equal sides are equal.

Front

What is a scalene triangle?

Back

A triangle with all sides of different lengths and all angles of different measures.

Front

How can you determine if a triangle is isosceles?

Back

By measuring the lengths of the sides; if two sides are equal, it is isosceles.

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height.