A).Quadrilateral means any polygon with four sides or four edges. Hence a square is a regular quadrilateral with four equal sides or edges.
B). Given any quadrilateral ABCD, BC and CD are adjacent and not BC and AD.
C). A rectangle is an equiangular quadrilateral. Equiangular means having equal angles. Rectangle have all the angles equal of 90 degree. Other example of equiangular quadrilateral is a square.
D). By theorem of parallelogram, if a quadrilateral is a parallelogram, then it has two sets of opposite sides congruent.
B. Given quadrilateral ABCD, BC⎯⎯⎯⎯⎯⎯⎯⎯ and AD⎯⎯⎯⎯⎯⎯⎯⎯ are adjacent
Step-by-step explanation:
A. A square has 4 congruent sides and 4 congruent angles, so it is a regular polygon. True.
B. Draw the quadrilateral and label the vertices in the order shown. Given quadrilateral ABCD, BC and AD are opposite sides, not adjacent sides. False.
C. All angles of a rectangle are right angles that measure 90 degrees. True.
