What is the formula for the SUM of the interior angles of a convex polygon?

Given segment BE is congruent to segment ED and segment AE is congruent to segment EC. Is ABCD a parallelogram? YES or NO? If YES, which one of the 5 ways justifies your answer?

TRUE or FALSE: The diagonals of a parallelogram are perpendicular.

Which quadrilateral(s) has congruent diagonals?

True of False: Consecutive sides of a parallelogram are congruent

ABCD is a parallelogram. AB = 26 and BC = 26. Which SPECIAL parallelogram is ABCD?

True or False: The diagonals of a rhombus bisect each other

True or False: All sides of a rhombus are congruent.

True or False: Diagonals of a square are congruent, perpendicular and bisect the angles.

True or False: Every Square is a Rhombus

True or False: Consecutive angles of a parallelogram are supplementary

Given segment BC is parallel to segment AD and segment BA is parallel to segment CD. Is ABCD a parallelogram? YES or NO? If YES, why? Justify with one of the 5 ways.

What is the formula for the SUM of ALL EXTERIOR angles of a convex polygon?