"Question 1 Find the volume of a sphere whose radius is (i) 7 cm (ii) 0.63 m
Class 9 - Math - Surface Areas and Volumes Page 236"
Answers
VOLUME:
The space occupied by an object solid body is called the volume of the particular object solid body volume is always measured in cubic unit.
Sphere:
A sphere is a three dimensional figure which is made up of all points in the space which lie at a constant distance from a fixed point called the centre of the sphere and a constant distance is called its radius.
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Given:
i) Radius of the sphere(r) = 7 cm
Volume of the sphere = 4/3πr³
= (4/3 × 22/7 × 7 × 7 × 7)
=(88×7×49)/3×7
=4312/3=
1437 ⅓
= 1437 ⅓ cm³
Volume of the sphere =1437 ⅓ cm³
(ii) Given:
Radius of the sphere(r) = 0.63 m
Volume of the sphere = 4/3πr³
= (4/3 × 22/7 × 0.63 × 0.63 × 0.63)
= 4×22×.09×.21× 0.63
= 1.0478 m³
Volume of the sphere =1.0478 m³
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Hope this will help you....
.1)We have r =radius of the sphere=7cm
=(4/3×22/7×7×7×7)cm cube.
=4312/3 cm cube
2)We have r=radius of the sphere =0.63m
Volume of the sphere =4/3πr cube
=(4/3×22/7×0.63×0.63×0.63)cm cube
=1.05 m cube (approx)...
Hope it's helpful....