If the radius of a circle is decreased by 50% , find the percentage decrease in its area.

The area of sector of a circle of radius 5 cm, formed by an arc of length 3.5 cm is?

Radhika runs along the boundary of a rectangular park at the rate of 12 km/hr and completes one full round in 15 minutes. If the length of the park is 4 times its breadth , the area of the park is?

What is the area of a square having perimeter 68 cm?

The altitude of an equilateral triangle of side 2 ? 3 cm is?

Square units 13 by 9 of an office area is

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