Area

31 If the radius of a circle is increased by 75%, then it's circumference will increase by

32 The length of a rectangular hall is 5 m more than it's breadth. The area of the hall is 750 m×. The length of the hall is

33 A circular ground whose diameter is 35 metres, has a 1.4 m broad garden around it. What is the area of the garden in square metres?

34 A man walked diagonally across a square plot. Approximately what was the per cent saved by not walking along the edges?

35 The number of marble slabs of size 20 cm×30 cm required to pave the floor of a square room of side 3 metres, is

36 The sides of a triangle are in the ratio of $$\frac{1}{2}$$:1/3:1/4 ‘ If the perimeter is 52 cm, then the length of the smallest side is

37 The perimeter of a square is 48 cm. The area of a rectangle is 4 cm° less than the area of the square. If the length of the rectangle is 14 cm, then it's perimeter is

38 If the perimeter of an isosceles right triangle is (6 + 3RT2) m, then the area of the triangle is:

39 A hall 39 m 10 cm long and 35 m 70 cm broad is to be paved with square tiles. Find the largest tile so that the tiles exactly fit and also find the number of tiles required:

40 8 If the length of a rectangle is increased by 5% and the breadth of the rectangle is decreased by 6%, then find the percentage change in area: