10 Questions Geometry: Properties of Quadrilaterals Understand the properties of Quadrilaterals, including opposite sides, opposite angles, and diagonals and apply these relationships to solve problems. Geometry for grade10, base... Which statement is true about all parallelograms? Consecutive angles are congruent. All four sides are congruent. Pairs of opposite sides are congruent. Diagonals are perpendicular. A parallelogram is shown. What is the length of side AB? 6 9 18 30 The ratio of two angle measures in a parallelogram is 2:3. The measure of the smaller angle is 108° 72° 60° 36° … and 7 more awesome questions! Check them out by clicking “Play”.