Question

Find the radius of a sphere whose surface area is 154 cm^2.

Answer 1

Step-by-step explanation:

4pie r^2 = 154

pie r^2 = 77/2

r^2 = 77/2 × 7/22

r^2 = 7/2× 7/2

r^2 = 49/4

r = 7/2 answer

Answer 2

Answer:

Question:-

1. Find the radius of a sphere whose surface area is $\rm 154 cm^{2}$?

To find,

• The radius of a sphere

Given that:-

• Radius = ?

• Surface area = $\rm 154 cm^{2}$

Solution:-

   Surface area of sphere = $\rm 4\pi r^{2}$

✔  $\rm 4\pi r^{2} =154$

✔ $\rm 4\times\frac{22}{7} \times r^{2}=154$

✔ $\rm r^{2} =\frac{154 \times 7}{4 \times 22} =12.25$

✔ r = $\rm{\sqrt{12.25} =3.5cm}$

       So the required answer is 3.5cm