Area circumference of circles and surface area of solids. - One Line Questions

1. If the area of a circle is A, what is its radius? — √(A/π)
2. The lateral surface area of a cylinder is 880 cm² and its base radius is 14 cm. Find its height. (Use π = 22/7) — 20 cm
3. A cylinder has a radius of 7 cm and its volume is 1540 cm³. Find its height. (Use π = 22/7) — 20 cm
4. A rectangular sheet has dimensions 20 cm x 10 cm. If it is rolled to form a cylinder with height 10 cm, what is the radius of the cylinder? — 20/π cm
5. The radius of a circle is increased by 10%. By what percentage does its area increase? — 21%
6. A circle has an area of 616 cm². What is its diameter? (Use π = 22/7) — 28 cm
7. If the radius of a circle is 7 cm, what is its circumference? (Use π = 22/7) — 44 cm
8. If the radius of a circle is 7 cm, what is its area? (Use π = 22/7) — 154 cm²
9. If the diameter of a circle is 28 cm, what is its area? (Use π = 22/7) — 616 cm²
10. A sphere has a diameter of 6 cm. Find its volume. (Use π = 3.14) — 56.52 cm³
11. A cone has a radius of 6 cm and a slant height of 10 cm. What is its surface area? (Use π = 3.14) — 282.6 cm²
12. A cuboid has a volume of 120 cm³. If its length is 6 cm and breadth is 5 cm, what is its height? — 4 cm
13. A cuboid has a total surface area of 200 cm². If its length is 8 cm and breadth is 6 cm, find its height. — 2 cm
14. What is the formula for the lateral surface area of a cuboid with length 'l', breadth 'b', and height 'h'? — 2(l + b)h
15. What is the total surface area of a cuboid with length 'l', breadth 'b', and height 'h'? — 2(lb + bh + hl)
16. A cube has a side length of 5 cm. What is its surface area? — 150 cm²
17. A sphere has a radius of 3 cm. What is its surface area? (Use π = 3.14) — 113.04 cm²
18. What is the formula for the area of a circle? — πr²
19. What is the surface area of a cylinder with radius 'r' and height 'h'? — 2πr(r + h)
20. What is the lateral surface area of a cylinder with radius 'r' and height 'h'? — 2πrh
21. What is the surface area of a hemisphere with radius 'r'? — 3πr²
22. What is the volume of a cylinder with radius 'r' and height 'h'? — πr²h
23. What is the volume of a cone with radius 'r' and height 'h'? — (1/3)πr²h
24. The surface area of a sphere is 154 cm². Find its radius. (Use π = 22/7) — 3.5 cm
25. A cone has a radius of 9 cm and a height of 12 cm. Find its volume. (Use π = 3.14) — 1017.36 cm³
26. A cylinder has a radius of 4 cm and a height of 10 cm. What is its surface area? (Use π = 3.14) — 351.68 cm²
27. The radius of a circular garden is 14 meters. Find its area. (Use π = 22/7) — 616 m²
28. What is the diameter of a circle if its radius is 10 cm? — 20 cm
29. A cone's radius is 3 cm and its height is 4 cm. Find its slant height. — 5 cm
30. What is the radius of a circle if its diameter is 24 cm? — 12 cm
31. If the circumference of a circle is 88 cm, what is its radius? (Use π = 22/7) — 14 cm
32. If the area of a circle is 154 cm², what is its radius? (Use π = 22/7) — 7 cm
33. A circle has a circumference of 44 cm. What is its diameter? (Use π = 22/7) — 14 cm
34. If the circumference of a circle is 66 cm, what is its radius? (Use π = 22/7) — 10.5 cm
35. The total surface area of a cube is 294 cm². What is the length of its side? — 7 cm
36. The circumference of a circular plot is 132 meters. Find its radius. (Use π = 22/7) — 21 meters
37. A spherical ball has a radius of 6 cm. What is its volume? (Use π = 3.14) — 904.32 cm³
38. A cuboid has dimensions 10 cm x 5 cm x 3 cm. What is its total surface area? — 190 cm²
39. If the radius of a circle is doubled, its circumference is: — Doubled
40. If the radius of a circle is doubled, its area is: — Quadrupled
41. What is the volume of a cuboid with length 'l', breadth 'b', and height 'h'? — lbh
42. What is the surface area of a cube with side length 's'? — 6s²
43. What is the volume of a cube with side length 's'? — s³
44. The ratio of the circumference to the diameter of any circle is: — π
45. What is the perimeter of a semicircle with radius 'r'? — πr + 2r
46. What is the surface area of a cone with radius 'r' and slant height 'l'? — πr(r + l)
47. What is the formula for the circumference of a circle? — 2πr
48. What is the surface area of a sphere with radius 'r'? — 4πr²
49. What is the area of a semicircle with radius 'r'? — (1/2)πr²
50. What is the volume of a sphere with radius 'r'? — (4/3)πr³
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