Practicing Success

Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Mensuration: 2D

Question:

The volume of the sphere is 38,808 cm3. What is the surface area of the sphere ?

Options:

4455 cm2

4433 cm2

5544 cm2

3344 cm2

Correct Answer:

5544 cm2

Explanation:

We know that,

The volume of Sphere = \(\frac{4}{3}\)πr3

The total surface area of sphere = 4πr2

We have,

The volume of the sphere = 38808 cm3

= \(\frac{4}{3}\)πr3= 38808

= \(\frac{4}{3}\) × \(\frac{22}{7}\)× r3 = 38808

= r3 = 38808 × \(\frac{7}{22}\)× \(\frac{3}{4}\)

= r= 9261

= r = 21

Now, The total surface area of sphere = 4πr2 = 4 × \(\frac{22}{7}\)× 21 × 21 The surface area of the sphere = 5544 cm2