Question

7 cm त्रिज्या वाले एक गोले का पृष्ठीय क्षेत्रफल ज्ञात कीजिए।​

Answer 1

Given:

7 cm त्रिज्या वाले एक गोले का पृष्ठीय क्षेत्रफल ज्ञात कीजिए।

To find:

Surface Area

Solution:

The radius of the given sphere, r = 7 cm

The formula of the curved surface area of a sphere is as follows:

$\boxed{\bold{Surface\:Area \:of \:a \:sphere = 4 \pi r^2}}$

By substituting the value of r = 7 cm in the above formula, we get

The surface area of the given sphere is,

= $4 \times \frac{22}{7} \times 7^2$

= $4 \times 22\times 7$

= $\bold{616 \:cm^2}$

Thus, the surface area of the sphere of radius 7 cm is → 616 cm².

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Answer 2

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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