61.
The area of the largest triangle that can be inscribed in a semi-circle of radius r, is :

62.
If radius of a circle is 3 cm, what is the area of the circle in sq. cm ?

63.
The base of an isosceles is 14 cm and its perimeter is 36 cm. Find its area.

64.
The total cost of flooring a room at Rs. 8.50 per square metre is Rs. 510. If the length of the room is 8 m, its breadth is :

65.
The diagonal of a rectangular field is 15 metres and the difference between its length its length and width is 3 metres. The area of the rectangular field is :

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