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

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

True or False: Every square is a rectangle

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.

True or False: Every rhombus is a square

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: Every rectangle is a square

Given Rhombus FCHS, what is the measure of angle 7?

One interior angle of a regular polygon is 168 degrees. Find the number of sides of the polygon.

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

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

True of False: Consecutive sides of a parallelogram are congruent

Given Trapezoid CRMA with median OL. If CA = 15 and OL = 10, Find RM.