Question

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Calculate the curved surface of a sphere whose diameter is 14cm











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Answer 1

Solution -

We have,

• Diameter of a sphere = 14cm

If diameter is 14cm, then

• Radius = 7cm

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We have to find the curved surface area of the sphere. We will use the given formula.

$\large\bf{\longmapsto{\boxed{\pink{CSA = 4 \pi r^2}}}}$

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Putting values

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

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$\sf\dashrightarrow{CSA = 4 \times \dfrac{22}{7} \times 49}$

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$\sf\dashrightarrow{CSA = 4 \times 22 \times 7}$

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$\sf\dashrightarrow{CSA = 88 \times 7}$

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$\frak\dashrightarrow{\purple{CSA = 616\: cm^2}}$

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★ $\small\underline{\mathcal{Hence,\: CSA\: of\: sphere\: is\: 616cm^2.}}$

Answer 2

Given:-

• Diameter of a sphere is 14 cm.

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To find:-

• Curved surface area of a sphere.

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Solution:-

★ In this question we have given that the diameter of a sphere is 14 cm. We have to find out the curved surface area of a sphere. Let's do it.

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According to the question,

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⇢ CSA = 4πr²

⇢ CSA = 4 × 22/7 × (7)²

⇢ CSA = 4 × 22/7 × 49

⇢ CSA = 4 × 22 × 7

⇢ CSA = 88 × 7

⇢ CSA = 616 cm²

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Hence,

• The curved surface area of a sphere is 616 cm².