Isosceles and Equilateral triangles practice

Front

What are the properties of an equilateral triangle?

Back

All sides are of equal length, and all angles measure 60°.

Tags

CCSS.4.G.A.2

Front

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

Back

The angles opposite the congruent sides are equal.

Tags

CCSS.HSG.CO.C.10

Front

If one angle of an isosceles triangle measures 40°, what is the measure of the vertex angle?

Back

100°.

Tags

CCSS.8.G.A.5

Front

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

Back

180°.

Tags

CCSS.8.G.A.5

Front

In an isosceles triangle, if the base angles are equal, what can be said about the sides?

Back

The sides opposite the equal angles are congruent.

Front

How do you find the measure of an unknown angle in a triangle?

Back

Subtract the sum of the known angles from 180°.

Tags

CCSS.8.G.A.5

Front

What is the definition of congruent triangles?

Back

Triangles that have the same size and shape, meaning all corresponding sides and angles are equal.

Tags

CCSS.8.G.A.2

Front

What is the formula for the area of an equilateral triangle?

Back

Area = (√3/4) * side².

Tags

CCSS.6.G.A.1

Front

If two sides of a triangle are congruent, what can be inferred about the angles opposite those sides?

Back

The angles opposite the congruent sides are also congruent.

Tags

CCSS.HSG.CO.C.10

Front

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

Back

Each angle measures 60°.

Tags

CCSS.8.G.A.5