Question

SURFACE AREAS AND VOLUMES
217
The diameter of a roller is 84 cm and its length is 120 cm. It takes 500 complete
revolutions to move once over to level a playground. Find the area of the playground
in m
5. A cylindrical pillar is 50 cm in diameter and 3.5 m in height. Find the cost of painting
the curved surface of the pillar at the rate of 12.50 per m2.
6. Curved surface area of a right circular cylinder is 4.4 m². If the radius of the base of the
cylinder is 0.7 m, find its height.
7. The inner diameter of a circular well is 3.5 m. It is 10 m deep. Find
(1) its inner curved surface area,
per
m.
(1) the cost of plastering this curved surface at the rate of 3 40
eating system, there is a cylindrical pipe of length 28 m and diameter​

Answer 1

Answer:

120 cm 120cm 120 cm 120cm

120 cm 120cm

Answer 2

Step-by-step explanation:

To find area of a rectangle we have to multiply length and breadth or width.

To find the area of square we have to multiply the two sides.

To find square and rectangle we have to add all the sides and lenghth and breadth or width