Question

Total surface area of sphere is 1386cmsq .Find radius of sphere?

Answer 1

Answer:

Step-by-step explanation:  surface area of sphere is given by

sf = 4/3 x 3.14 xr^3

sf=1386

3x1386/4x3.14=r^3

(358.4)^1/3=r

r=119.5

Answer 2

Answer:

• Radius of sphere = 10.5 cm

Step-by-step explanation:

Given:

• Total surface area of sphere = 1386 cm²

To Find:

• Radius of sphere.

Now, we know that,

⇒ Total Surface area of sphere = 4πr²

⇒ 1386 = 4 × 22/7 × r²

⇒ 1386 × 7 = 88 × r²

⇒ 9702 = 88 × r²

⇒ r² = 9702/88

⇒ r² = 110.25

⇒ r = √110.25

⇒ r = 10.5 cm

Hence, Radius of sphere = 10.5 cm