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CBSE Class 9 Answered

Can you please answer these all questions

Asked by nishimuthu21 | 05 Jul, 2020, 11:06: AM
Expert Answer
(1) Find the surface area of the biggest sphere, which can fit in a cube of side 8a.
Solution:
Side of cube = 8a
The biggest sphere which can fit into the cube touches the faces of the cube.
Diameter of the sphere = 8a
Radius of the sphere = 4a

S u r f a c e space a r e a space o f space s p h e r e space equals space 4 πr squared space
equals 4 cross times 22 over 7 cross times 4 straight a cross times 4 straight a
equals 22 over 7 cross times 64 straight a squared
equals 1408 over 7 straight a squared
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