Lesson 12A Equilateral and Isosceles Triangles Practice

Front

What is an equilateral triangle?

Back

An equilateral triangle is a triangle in which all three sides are of equal length and all three angles measure 60 degrees.

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has 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

The sum of the interior angles of a triangle is always 180 degrees.

Front

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

Back

The other two angles each measure 70 degrees.

Front

What do the angles in an equilateral triangle measure?

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

What is the base of a triangle?

Back

The base of a triangle is any one of its sides, often referred to when calculating the area.

Front

How do you find the area of a triangle?

Back

The area of a triangle can be found using the formula: Area = 1/2 * base * height.

Front

What is the measure of angle A in an isosceles triangle if the other two angles are 70 degrees each?

Back

Angle A measures 40 degrees.

Front

In triangle ABC, if angle A = 60 degrees and angle B = 60 degrees, what is angle C?

Back

Angle C measures 60 degrees.

Front

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

Back

In an isosceles triangle, the angles opposite the equal sides are equal.