Question

7 सेंटीमीटर त्रिज्या वाले गोले का पृष्ठीय क्षेत्रफल ज्ञात कीजिए​

Answer 1

SOLUTION

TO DETERMINE

The surface area of a sphere with a radius of 7 cm

FORMULA TO BE IMPLEMENTED

If the radius of a sphere is r unit then total surface area of the sphere is

$\sf{ = 4\pi {r}^{2} } \: \: \: sq.unit$

EVALUATION

Here we have to find the surface area of a sphere with a radius of 7 cm

So

Radius of the sphere = r = 7 cm

Hence the required total surface area of the sphere

$\sf{ = 4\pi \times {(7)}^{2} } \: \: {cm}^{2}$

$\displaystyle\sf{ = 4 \times \frac{22}{7} \times 49\: \: {cm}^{2} }$

$\displaystyle\sf{ = 4 \times 154\: \: {cm}^{2} }$

$\displaystyle\sf{ = 616\: \: {cm}^{2} }$

FINAL ANSWER

Hence the required surface area of a sphere with a radius of 7 cm = 616 cm²

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