1. Find the area (in cm2) of a parallelogram whose base is 42 cm and height is 9 cm.   Hint Hint       2. Find the perimeter (in cm) of a rhombus whose diagonals are 36 cm and 48 cm.   Hint       3. 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       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. If the lengths of the diagonals of a rhombus are 18 cm and 40 cm respectively, find its area (in cm2).   Hint       6. The longer diagonal of a four-sided playground is 100 m. If the lengths of the perpendiculars from the opposite vertices to this diagonal are 11.2 m and 18.8 m respectively, calculate the area (in m2) of the playground.   Hint       7. If the area of a parellelogram is 588 m2, find its height (in m) given that its height is thrice its base.   Hint