Question

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Answer 1

$\huge{\mathbb{\red{ANSWER:-}}}$

Given :-

$\sf{The \: diameter \: of \: the \: ball = 42 \: cm}$

To Find :-

$\sf{how \: many \: leather \: is \: required \: for \: making \: the \: ball ?}$

Using Formula :-

$\sf{Surface \: Area \: of \: sphere = 4\pi r^{2}}$

Solution :-

For the ball -

$\sf{radius (r) =\dfrac{d}{2}=\dfrac{42}{2} = 21 \: cm}$

$\sf{Requirements \: of \: leather \: for \: making \: the \: ball-}$

$\sf{= 4\pi r^{2}}$

$\sf{= 4\times \dfrac{22}{7}\times (21)^{2}}$

$\sf{= 4\times \dfrac{22}{7}\times 21\times 21}$

$\sf{= 4\times 22\times 3\times 21}$

$\sf{= 88\times 63}$

$\sf{= (100-12)\times 63}$

$\sf{= (6300 - 756)}$

$\sf{= (6300 - 800 + 44)}$

$\sf{= 5544 \: cm^{2}}$

$\sf{we \: need \: 5544 \: cm^{2} \: of \: leather \: for \: making \: the \: ball.}$

Answer 2

Answer:

5544cm²

Step-by-step explanation:

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