Maths

1. If  the radius of a circle is decreased by 50% then its area decreased by 75%

2. If each side of a  square is increased by 25% then its area increased by 56.25%

3. The percentage increase in the area of a rectangle  if each of its sides is increased by 20% is 44%

4. If the area of a square increased by 69% then the side of the square increased by 30%

5. If the side of  an equilateral triangle decreased by 20%, its area decreased by 36%

6. If the radius of a circle is increased  by 75% then its circumference will increase by 75% 

7. If the radius of a circle is  increased by 6% then the area is increased by 12.36%

8. If the radius of a circle is diminished   by 15% then its area is diminished by 19%

9. If the radius of a circle is doubled, its area is increased by 300%

10. The area of the larger triangle that can be inscribed in a semi-circle of radius r is r2

11. If the edge of a cube is increased by 50% then  % increase in its surface area 125%

12. Two cubes have their volumes  in the ratio 1:27 than the ratio of their surface Area = 1:9

13. If the radius of a sphere is increased by 50%, % increase in volume and % increase in surface area in 237.5  125% respectively

14. How many bricks, each measuring 25cm x 11.25cm x 6cm will be needed to build a wall 8m x 6mx 22cm = 6400

15. If  the volume of two cubes are in the ratio 27:1, then the  ratio of their edge 3:1

16. The volume of two cubes in the ratio of   8:27, The ratio of their surface Area-4:9

17. If the radius of sphere is doubled  its volume becomes 8 times 

18. volume of two sphere in the ratio of 64:27. then the ratio of their surface Area 16:9

19. surface  Area of two sphere in the ratio 4:25, then the ratio of their volume 8:125

20. volume of hemisphere 1940cm3 its radius 21cm

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