Question

222
Mathematics for Class 8
.. a3 = 343 = 7x7x7 > a = 7.
So, the length of each edge of the cube = 7 cm.
otal surface area of the cube = (ba”) sq units
= 6 x 7 x 7) cm 2 = 294 cm 2.
EXERCISE 20A
1. Find the volume, lateral suria
le volume, lateral surface area and the total surface area of the ci
dimensions are:
(1) length = 22 cm, breadth = 12 cm and height = 7.5 cm
(ii) length = 15 m. breadth = 6 m and height = 9 dm
(111) length = 24 m, breadth = 25 cm and height = om
(iv) length = 48 cm, breadth = 6 dm and height = 1 m
2. The dime
the dimensions of a rectangular water tank are 2 m 75 cm by 1 m 80 cm byl
many litres of water does it hold when filled to the brim?
la rectangular piece of iron measures 1.05 m x 70 cm x 1.5 cm. Find th
piece in kilograms if 1 cm 3 of iron weighs 8 grams.
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Answer 1

Answer:

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