Isosceles and Equilateral triangles practice

Front

What is an isosceles triangle?

Back

An isosceles triangle is a triangle that has at least two sides of equal length.

Tags

CCSS.4.G.A.2

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 are 60°.

Tags

CCSS.4.G.A.2

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°.

Tags

CCSS.8.G.A.5

Front

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

Back

The sides opposite the equal angles are also equal in length.

Tags

CCSS.8.G.A.5

Front

In an isosceles triangle, if the vertex angle is 40°, what are the measures of the base angles?

Back

The base angles will each measure 70°.

Tags

CCSS.8.G.A.5

Front

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

Back

All angles in an equilateral triangle are equal and each measures 60°.

Tags

CCSS.8.G.A.5

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

If one angle of an isosceles triangle is 88°, what are the measures of the other two angles?

Back

The other two angles are each 46°.

Tags

CCSS.8.G.A.5

Front

What is the formula for the area of a triangle?

Back

Area = 1/2 * base * height.

Tags

CCSS.6.G.A.1

Front

In an equilateral triangle with a side length of 6, what is the height?

Back

The height is approximately 5.2.

Tags

CCSS.6.G.A.1