1. The sum of the parallel sides (a and b) of a trapezium is twice the area (A) divided by the distance (d) between the parallel sides.   Hint Hint       2. Temperature in Fahrenheit (F) decreased by 32 equals 1.8 times the temperature in Celsius (C).   Hint       3. Area (A) of a rectangle is the product of its length (L) and breadth (B).   Hint       4. The sum of the magnitude of the interior angles (A) of a convex polygon divided by 180 equals the number of sides (s) decreased by 2.   Hint       5. Curved Surface area (S) of a right cone is (22/7) times the product of the radius (r) and the slant height (L).   Hint       6. Perimeter (P) of an equilateral triangle is thrice the length of a side (a) of the triangle.   Hint       7. Surface area (S) of a cube equals six times the square of an edge (a) of the cube.   Hint