Two equal circle are drawn in square in such a way that a side of the square forms diameter of each circle. If the remaining area of the square is 42 cm2, how much will the diameter of the circle measure ?

The base of triangle is 15 cm and height is 12 cm the height of another triangle of double the area having base 20 cm is :

The difference between the length and breadth of a rectangle is 23 m. If its perimeter is 206 m, then its area is :

The length of a rectangle is three times of its width. If the length of the diagonal is $$8\sqrt {10} $$ cm, then the perimeter of the rectangle is :

A typist uses a paper 30 cm by 15 cm. He leaves a margin of 2.5 cm at the top and bottom and 1.25 cm on either side. What percentage of paper area is approximately available for typing ?

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