Answers

2015-11-24T20:12:33+05:30
Surface area of the sphere=(4π×5×5) cm²
= (100π) cm².

Curved surface area of the cone=(π×4×l) cm²
=(4πl) cm²

∴ 100π=5×(4πl) ⇒ l=5 cm.
Now, l² = h² + r²
5²= h² + 4²
h²= 9 
h= 3 cm.
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Hope it may help you... :)
how is h square equal to 9?
h squared = 3 squared
h squared = 5 squared - 4 squared  => h squared = 25-16 => h squared=9 => h= root 9 => h=3....(square of 3 = 9)
Have you got that now?