Question

find the radius of the sphere whose surface area is 145 cm square.​

Answer 1

Answer:

Radius is 3.4058 cm

Step-by-step explanation:

Surface area of sphere = 4π$r^2$

145 cm^2           = 12.56 $.r^2$

145/12.56          = r^2      

11.54  = r^2

$\sqrt{11.54}$ = r

3.4058 cm = r  

Answer 2

SA (Surface Area) of a sphere = 4 pi r^2
SA = 145 cm^2

145 = 4 * 22/7 * r^2 [Taking pi as the approximate value which is 22/7]
(145 * 7) / (4 * 22) = r^2
1015 / 88 = r^2
11.53 (approximate value) = r^2
r = root of 11.53
r = 3.39 ( approximate value)

Therefore, the radius of the sphere is 3.39 cm. (Remember, this is only an approximate value!)

Hope this helps you! ~