Interior Angles of Triangles

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

Back

It is a right triangle.

Tags

CCSS.4.G.A.2

Front

What is an acute angle?

Back

An acute angle is an angle that measures less than 90°.

Tags

CCSS.4.G.A.1

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that measures more than 90° but less than 180°.

Tags

CCSS.4.G.A.1

Front

How do you find the missing angle in a triangle?

Back

Subtract the sum of the known angles from 180°.

Tags

CCSS.8.G.A.5

Front

If two angles of a triangle are 45° and 45°, what is the measure of the third angle?

Back

The third angle measures 90°.

Tags

CCSS.8.G.A.5

Front

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

Back

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

Tags

CCSS.HSG.CO.C.11

Front

What is a scalene triangle?

Back

A scalene triangle is a triangle with all sides and angles of different measures.

Tags

CCSS.4.G.A.2

Front

If one angle of a triangle is 60° and another is 80°, what is the measure of the third angle?

Back

The third angle measures 40°.

Tags

CCSS.8.G.A.5

Front

What is the formula to calculate the missing angle in a triangle?

Back

Missing angle = 180° - (Angle 1 + Angle 2).

Tags

CCSS.8.G.A.5