Area of a square is 64 m2. If its perimeter is doubled then the new area of the square (in m2) is1). 1282). 1923). 2564). 320
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1. Find the volume (in cm3) of a sphere of diameter 42 cm.
2. One side of a square is increased by 30%. To maintain the same area, the other side will have to be decreased by
3. The diagonal of a square is 10√2 cm, find its perimeter?
4. In a rhombus ABCD, $\angle A$ = $60^{0}$ and AB = 12 cm. Then the diagonal BD is
5. A tent is to be built in the form of a cylinder of radius 7 m surmounted by a cone of the same radius. If the height of the cylindrical part is 8 m and slant height of the conical part is 12 m, how much canvas will be required to build the tent? Allow 20% extra canvas for folding and stitching. (Take π = 22/7)
6. A cone, hemisphere and a cylinder stand on equal bases have heights in the ratio 3: 2: 1. The ratio of their volumes is
7. A circular swimming pool is surrounded by a concrete wall 4m wide. If the area of the circular concrete wall surrounding the pool is 11/25 that of the pool, then the radius (in m) of the pool∶
8. In triangle ABC, AD, BE and CF are the medians intersecting at point G and area of triangle ABC is 156 sq.cm. What is the area (in sq.cm) of triangle FGE?
9. O is an centre of a circle. P is an external point of it at distance of 13cm from O. The radius of the circle is 5cm. Then the length of a tangent to the circle from P upto the point of contact is
10. The volume of a right dreular cone is 1232 cu.cm. and Its vertical height is 24 cm. Its curved surface area is
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