Interior & Exterior Angles of a Triangle

Front

What is an interior angle of a triangle?

Back

An interior angle is formed by two sides of a triangle that meet at a vertex, and it is located inside the triangle.

Tags

CCSS.8.G.A.5

Front

What is an exterior angle of a triangle?

Back

An exterior angle is formed by one side of a triangle and the extension of an adjacent side. It is located outside the triangle.

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.

Tags

CCSS.8.G.A.5

Front

How do you find the measure of a missing interior angle in a triangle?

Back

To find a missing interior angle, subtract the sum of the known angles from 180 degrees.

Tags

CCSS.8.G.A.5

Front

What is the relationship between an exterior angle and the two opposite interior angles?

Back

An exterior angle is equal to the sum of the two opposite interior angles.

Tags

CCSS.8.G.A.5

Front

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

Back

It is a right triangle.

Tags

CCSS.4.G.A.2

Front

What is a supplementary angle?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Tags

CCSS.7.G.B.5

Front

If two angles of a triangle are 36 degrees and 56 degrees, what is the measure of the third angle?

Back

The third angle measures 88 degrees (180 - 36 - 56 = 88).

Tags

CCSS.8.G.A.5

Front

What is the measure of angle b if angle a is 90 degrees and angle c is 54 degrees?

Back

Angle b measures 36 degrees (180 - 90 - 54 = 36).

Tags

CCSS.7.G.B.5

Front

How do you determine if a triangle is valid based on its angles?

Back

A triangle is valid if the sum of its interior angles equals 180 degrees.

Tags

CCSS.8.G.A.5