Question

if the surface area of the sphere is 154 cm², find its radius​

Answer 1

★Here is your answer ★

Let r be the radius of the sphere

surface area of the sphere=4πr sq

Also surface area=154cm sq

4πr sq=154

4×22/7×r sq=154

r sq=154×7/4×22=12.25

r=+√12.25=3.5

Hence the radius of the sphere=3.5cm

★Hope this helps★

Answer 2

$<b>$Surface area of sphere = 4πr²

4πr² = 154

4×22/7×r²=154

r² = $\dfrac{154×7}{4×22}$

r = $\dfrac{7}{2}$

$\bold{\boxed{r = 3.5}}$