Polygon Angles and Parallelograms

Front

What is a parallelogram?

Back

A parallelogram is a four-sided figure (quadrilateral) where opposite sides are parallel and equal in length, and opposite angles are equal.

Front

What is the sum of the interior angles of a polygon with n sides?

Back

Front

How many sides does a polygon have if the sum of its interior angles is 900°?

Back

The polygon has 7 sides.

Front

What is the sum of the angle measures in a nonagon (9 sides)?

Back

The sum of the angle measures in a nonagon is 1260°.

Front

What is the relationship between the angles in a parallelogram?

Back

In a parallelogram, opposite angles are equal, and adjacent angles are supplementary (sum to 180°).

Front

If one angle of a parallelogram is 70°, what are the measures of the other angles?

Back

The opposite angle is also 70°, and the adjacent angles are each 110°.

Front

What is the formula to find the area of a parallelogram?

Back

Front

What is a nonagon?

Back

A nonagon is a polygon with nine sides and nine angles.

Front

If two sides of a parallelogram are 10 cm and 15 cm, what can be said about the lengths of the opposite sides?

Back

The opposite sides of a parallelogram are equal, so the lengths of the opposite sides are also 10 cm and 15 cm.

Front

What is the measure of each interior angle of a regular nonagon?

Back

Each interior angle of a regular nonagon measures 140°.