1. If the area of a parellelogram is 588 m2, find its height (in m) given that its height is thrice its base.   Hint Hint       2. If the lengths of the diagonals of a rhombus are 18 cm and 40 cm respectively, find its area (in cm2).   Hint       3. 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       4. 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       5. The diagonals of a quadrilateral intersect at right angles. The lengths of the diagonals are 16 cm and 13 cm respectively. Calculate the area (in cm2) of the quadrilateral.   Hint       6. If the perimeter of a rhombus is 68 cm, calculate its area (in cm2) given that its one diagonal is 30 cm.   Hint       7. Calculate the area (in cm2) of a trapezoid whose parallel sides are 20 cm and 30 cm respectively and the distance between them is 9 cm.   Hint