56.
One of the diagonals of a rhombus is double the other diagonal. Its area is 25 sq. cm. The sum of the diagonal is ?

57.
Cost of fencing a circular plot at the rate of Rs. 15 per metre is Rs. 3300. What will be the cost of flooring the plot at the rate of Rs. 100 per square metre ?

58.
The ratio of the circumferences of two circles is 2 : 3. What is the ratio of their areas ?

59.
A circular road runs around a circular garden. If the difference between the circumference of the outer circle and the inner circle is 44 m, the width of the road is :

60.
The area of the greatest circle which can be inscribed in a square whose perimeter is 120 cm, is :

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