1. If two adjacent sides of a parallelogram are 10 cm and 20 cm and the distance between the shorter sides is 16 cm, calculate the distance (in cm) between the longer sides.   Hint Hint       2. If the area of a parellelogram is 588 m2, find its height (in m) given that its height is thrice its base.   Hint       3. The area of a quadrilateral is 1512 m2. The lengths of the perpendiculars from the opposite vertices to a diagonal are 14.6 m and 12.4 m respectively. What is the length (in m) of this diagonal?   Hint       4. Calculate the area (in cm2) of a rhombus whose one side is 25 cm and one diagonal is 30 cm.   Hint       5. If the area of a trapezoid is 243 m2 and its parallel sides are 15 m and 12 m, find the distance (in m) between them.   Hint       6. If the lengths of the diagonals of a rhombus are 18 cm and 40 cm respectively, find its area (in cm2).   Hint       7. If the perimeter of a rhombus is 68 cm, calculate its area (in cm2) given that its one diagonal is 30 cm.   Hint