Question

The surface area of a sphere is 616 cm2. Its radius is(a) 7 cm(b) 14 cm(c) 21 cm(d) 28 cm

Answer 1

Formula of the surface area of the sphere = 4πr²

Formula of the surface area of the sphere = 4πr²Given surface area of the sphere = 616 cm²

Formula of the surface area of the sphere = 4πr²Given surface area of the sphere = 616 cm²Therefore,

Formula of the surface area of the sphere = 4πr²Given surface area of the sphere = 616 cm²Therefore, surface area of the sphere = 4πr²

Formula of the surface area of the sphere = 4πr²Given surface area of the sphere = 616 cm²Therefore, surface area of the sphere = 4πr² B 616 cm² = 4 × 22/7 × r²

Formula of the surface area of the sphere = 4πr²Given surface area of the sphere = 616 cm²Therefore, surface area of the sphere = 4πr² B 616 cm² = 4 × 22/7 × r² 616 cm²/ 4 = 22/7 × r²

Formula of the surface area of the sphere = 4πr²Given surface area of the sphere = 616 cm²Therefore, surface area of the sphere = 4πr² B 616 cm² = 4 × 22/7 × r² 616 cm²/ 4 = 22/7 × r² 154 cm² = 22/7 × r²

Formula of the surface area of the sphere = 4πr²Given surface area of the sphere = 616 cm²Therefore, surface area of the sphere = 4πr² B 616 cm² = 4 × 22/7 × r² 616 cm²/ 4 = 22/7 × r² 154 cm² = 22/7 × r² 154 cm² × 7 = 22 × r²

Formula of the surface area of the sphere = 4πr²Given surface area of the sphere = 616 cm²Therefore, surface area of the sphere = 4πr² B 616 cm² = 4 × 22/7 × r² 616 cm²/ 4 = 22/7 × r² 154 cm² = 22/7 × r² 154 cm² × 7 = 22 × r² 1078 cm² = 22 × r²

Formula of the surface area of the sphere = 4πr²Given surface area of the sphere = 616 cm²Therefore, surface area of the sphere = 4πr² B 616 cm² = 4 × 22/7 × r² 616 cm²/ 4 = 22/7 × r² 154 cm² = 22/7 × r² 154 cm² × 7 = 22 × r² 1078 cm² = 22 × r² 1078 cm²/ 22 = r²

Formula of the surface area of the sphere = 4πr²Given surface area of the sphere = 616 cm²Therefore, surface area of the sphere = 4πr² B 616 cm² = 4 × 22/7 × r² 616 cm²/ 4 = 22/7 × r² 154 cm² = 22/7 × r² 154 cm² × 7 = 22 × r² 1078 cm² = 22 × r² 1078 cm²/ 22 = r² 49 cm² = r²

Formula of the surface area of the sphere = 4πr²Given surface area of the sphere = 616 cm²Therefore, surface area of the sphere = 4πr² B 616 cm² = 4 × 22/7 × r² 616 cm²/ 4 = 22/7 × r² 154 cm² = 22/7 × r² 154 cm² × 7 = 22 × r² 1078 cm² = 22 × r² 1078 cm²/ 22 = r² 49 cm² = r² √49 cm² = r

Formula of the surface area of the sphere = 4πr²Given surface area of the sphere = 616 cm²Therefore, surface area of the sphere = 4πr² B 616 cm² = 4 × 22/7 × r² 616 cm²/ 4 = 22/7 × r² 154 cm² = 22/7 × r² 154 cm² × 7 = 22 × r² 1078 cm² = 22 × r² 1078 cm²/ 22 = r² 49 cm² = r² √49 cm² = r 7 cm = r

Formula of the surface area of the sphere = 4πr²Given surface area of the sphere = 616 cm²Therefore, surface area of the sphere = 4πr² B 616 cm² = 4 × 22/7 × r² 616 cm²/ 4 = 22/7 × r² 154 cm² = 22/7 × r² 154 cm² × 7 = 22 × r² 1078 cm² = 22 × r² 1078 cm²/ 22 = r² 49 cm² = r² √49 cm² = r 7 cm = rTherefore, the radius of the sphere is 7 cm

I HOPE IT WILL HELP YOU

Answer 2

surface area is given that 616cm2

therefore,4πr2=616

πr2= 616÷4

22/7r2=154

r2=154×7/22

r2=77×7/11

r2=7×7

r2=49

r=√49

r=7cm

1. answer is (a) 7 cm