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2016-02-27T13:53:21+05:30

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First cone
A = πr (r+√(h²+r²))
A = π*2.1 (2.1+√(h²+2.1²))
A = 3.14*2.1 (2.1+√(4.1²+2.1²))
A = 44.25cm²

Second cone
A = πr (r+√(h²+r²))
A = π*2.1 (2.1+√(h²+2.1²))
A = 3.14*2.1 (2.1+√(4.3²+2.1²))
A = 45.43cm²

Area of sphere = 4πr²
45.43 + 44.25 = 4 * 3.14 * r²
89.68 = 12.56 * r²
7.14 = r²
r = 2.67cm
Therefore, Diameter = 2 * 2.67 = 5.34cm
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It is sphere buddy...! Not hemisphere so please correct it ;)
Mark as brainliest plzzzzz ;)
2016-02-27T13:55:58+05:30
V o l u m e  o f  t h e  f i r s t  c o n e = π × 2 . 1 2 × 4 . 1 3 V o l u m e  o f  t h e    s e c o n d  c o n e  = π  × 2 . 12 × 4 . 33 t o t a l  m a t e r i a l  =  π × 2 . 1 2 3 ( 4 . 1 + 4 . 3 ) = 12 . 348 π  c m  3  i f  t h e  r a d i u s o f  t h e s p h e r e = r t h e n  4 π r 3 3 = 12 . 348 π r = 2 . 08 c m  d i a m e t e r  o f  t h e  s p h e r e = 4 . 16 cm
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