Question

1. If the volume of the cuboid is 880 3
and the
area of its base is 88 2
. Find the height of the
cuboid.
2. To construct a wall 25 long , 0.3 thick and
6 high , bricks of dimensions
50 × 15 × 10 , each are used .
If the mortar occupies 1
10
ℎ of the volume of the
wall , find the number of bricks used .
3. If the curved surface area of a cylinder is 94.2 2
and height is 5 , then find radius of its base and
volume of the cylinder ( use = 3.14)
4. The radius and height of a cylinder are in the ratio
5 : 7 . If its volume is 4400 3
, find radius of the
cylinder .
5.A pen stand is cylindrical in shape with the base
radius 3.5 and height 10.5 . How much
card board will be required to make 25 such pen
Stand ? Also , find volume of 1 pen stand.

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

ans 1 - in the first pic

ans 2 - 540

ans3- Surface Areas and Volumes. (i) Let the radius of the base of the cylinder be r cm. Hence, the radius of the base is 3 cm. = 3.14 x (3)2 x 5 = 141.3 cm3.

ans4- Solution: Let x be the common in given ratios. ∴ Radius = 5x = 5(2) = 10 cm. Height = 7x = 7(2) = 14 cm.

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