1. Which one of the following formulas will find the sum of interior angles of a polygon with n sides? (1 point) 180(n − 2)

180(n − 360)

180(n − 1)

180n

2. If ABCD is a parallelogram, which of the following statements must be true? (1 point)

∠A ∠B and ∠C ∠D

AB = BC = CD = AD

AC = BD

AB = CD and BC = AD

3. Fill in the blank with always, sometimes, or never. If there is not enough information, choose

inconclusive.

A quadrilateral has one pair of parallel sides.

(1 point)

always

sometimes

never

inconclusive