Question

Determine the surface area of a sphere having a radius of 7 cm
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Answer 1

Answer:

616

Step-by-step explanation:

surface area of sphere = 4πr^2

= 4×22/7×7×7

= 4×22×7

= 22×28

= 616 .

Answer 2

$\large\underline\mathfrak\red{Given \: :- }$

• Radius of a sphere is 7 cm.

$\large\underline\mathfrak\red{To \: find \: :- }$

• Surface area of sphere

$\large\underline\mathfrak\red{Solution \: :- }$

We know that,

Radius of a sphere is 7 cm.

${\large{\underline{\boxed{\bf{\green{Surface \: area \: of \: sphere = 4πr² }}}}}}$

$\large\sf{Value \: of \: π = \frac{22}{7} }$

Finding surface area of sphere

$\sf\implies{Area = 4 \times \frac{22}{7} \times 7 }$

$\sf\implies{Area = 4 \times 22}$

$\sf\implies{Area = 88cm {}^{2} }$

${\large{\underline{\boxed{\bf{\pink{Area \: of \: sphere = 88cm² }}}}}}$

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$\large\underline\mathfrak\red{Extra \: information \: :- }$

$\sf{Volume \: of \: sphere = \frac{4}{3} \pi r {}^{3} }$

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