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 where all three sides are of equal length and all three angles are 60 degrees.

Front

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

Back

180 degrees.

Front

In an isosceles triangle, what can be said about the angles opposite the equal sides?

Back

They are equal.

Front

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

Back

60 degrees.

Front

If one angle of a triangle is 90 degrees, what type of triangle is it?

Back

Right triangle.

Front

What type of triangle has all angles less than 90 degrees?

Back

Acute triangle.

Front

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

Back

The larger the angle, the longer the opposite side.

Front

If two angles of a triangle are known, how can you find the third angle?

Back

Subtract the sum of the known angles from 180 degrees.

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height.