Unit 3B Flashcard: Polygons and Parallelograms

Front

What is the sum of interior angles for an octagon?

Back

1080 degrees.

Front

What is the formula to find the sum of interior angles of a polygon?

Back

(n - 2) × 180°, where n is the number of sides.

Front

What is the measure of each exterior angle of a regular polygon with 5 sides?

Back

72 degrees.

Front

How do you find the number of sides of a regular polygon given an exterior angle of 20 degrees?

Back

Number of sides = 360° / exterior angle = 360° / 20° = 18 sides.

Front

What is a parallelogram?

Back

A quadrilateral with opposite sides parallel and equal in length.

Front

What is one property that confirms a quadrilateral is a parallelogram?

Back

If the diagonals bisect each other.

Front

Which property is NOT true for a parallelogram?

Back

Diagonals are congruent.

Front

What is the relationship between opposite angles in a parallelogram?

Back

Both pairs of opposite angles are congruent.

Front

How do you calculate the measure of an interior angle of a regular polygon?

Back

(n - 2) × 180° / n, where n is the number of sides.

Front

What is the sum of the exterior angles of any polygon?

Back

360 degrees.