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 ?
( Ans. 44,000)
A well having 10m inside diameter is dug 8.4m deep.Earth taken out of it is spread all around it to a width of 7m to form a beautiful embankment.Find the height of embankmrnt.The contractor charged Rs500 per meter for digging and making the circular embankment on its total height of well and embankment.He measured the height of the embankment as 2m.How much extra money he made? The concerned officer accepted his calculations and paid the money to him as demanded. Who is guilty the contractor or the officer?Comment.
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.