Missing Angles and triangle Review

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°.

Front

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

Back

It is a right triangle.

Front

What is the measure of the missing angle if two angles of a triangle are 50° and 60°?

Back

The missing angle is 70° (180° - 50° - 60°).

Front

What is the definition of complementary angles?

Back

Complementary angles are two angles whose measures add up to 90°.

Front

What is the definition of supplementary angles?

Back

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

Front

If angle A is 65° and angle B is 115°, are they complementary or supplementary?

Back

They are supplementary because 65° + 115° = 180°.

Front

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

Back

Subtract the sum of the known angles from 180°.

Front

What is an isosceles triangle?

Back

An isosceles triangle has at least two sides that are equal in length.

Front

What is an equilateral triangle?

Back

An equilateral triangle has all three sides equal and all angles measuring 60°.

Front

If angle C is 25° and angle D is 75°, what is the measure of the missing angle in a triangle?

Back

The missing angle is 80° (180° - 25° - 75°).