Missing Sides and Angles of Quadrilaterals

Front

What is the sum of a quadrilateral's interior angles?

Back

360 degrees.

Front

How many degrees are in the missing angle if three angles are 70°, 80°, and 90°?

Back

The missing angle is 360° - (70° + 80° + 90°) = 120°.

Front

If a quadrilateral is a rectangle and one side is 10, what is the length of the opposite side?

Back

The length of the opposite side is also 10.

Front

Find the missing angle if two angles are 60° and 120°.

Back

The missing angle is 360° - (60° + 120°) = 180°.

Front

What is the measure of each angle in a square?

Back

Each angle in a square measures 90°.

Front

If one angle of a quadrilateral is 90° and the other three angles are 70°, 80°, and 120°, what is the missing angle?

Back

The missing angle is 360° - (90° + 70° + 80° + 120°) = 0°.

Front

What is the definition of a quadrilateral?

Back

A quadrilateral is a polygon with four sides and four angles.

Front

How do you calculate the missing angle in a quadrilateral?

Back

Subtract the sum of the known angles from 360°.

Front

What is the measure of the angles in a parallelogram?

Back

Opposite angles are equal, and adjacent angles are supplementary (sum to 180°).

Front

If two angles of a quadrilateral are 85° and 95°, what is the measure of the other two angles?

Back

The other two angles must sum to 360° - (85° + 95°) = 180°.