Find
(i) The lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5 m high.
Find
(i) The lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5 m high.
[Ans. Height = 20 m, R = 17.5 m]
9) S.A. of sphere; r = 12 cm, is 5 times the C.S.A. of a cone of radius 11 cm. Find h and v of cone ?
Q. Some poor children use recycled paper to make - conical party caps with radius 7 cm and slant height 15 cm and sell it on a street stall.
(a) How much would they earn profit on selling 50 caps? The selling price of cap is 50 paise per , while it costs Rs. 10 per 100 ?
(b) Which value is depicted by the children?
Q. A juice seller has 3 types of glasses of inner diameter 5cm to serve the customers. The height of the glasses is 10 cm. He decided to serve the customers in A type of glasses.
The 3 types of glasses are:
Type A glasses is with a plane bottom.
Type B glass is with hemispherical raised bottom.
Type C glass is with conical raised bottom of height 1.5 cm.
(a) Find the volume of each type of glasses (take pi = 3.14)
(b) By choosing a glass of type A, which value is depicted by juice seller
Q. A juice seller has 3 types of glasses of inner diameter 5cm to serve the customers. The height of the glasses is 10 cm. He decided to serve the customers in A type of glasses.
The 3 types of glasses are:
Type A glasses is with a plane bottom.
Type B glass is with hemispherical raised bottom.
Type C glass is with conical raised bottom of height 1.5 cm.
(a) Find the volume of each type of glasses (take pi = 3.14)
(b) By choosing a glass of type A, which value is depicted by juice seller
14. A rectangular strip, 16 cm x 3.5 cm is rotated about the longer side. Find the whole surface of the solid so generated.
Q.13. Find the volume of a sphere whose surface area is 55.44.