Question

If the volume and the surface area are numerically same then find its radius.

Answer 1

Answer:

Step-by-step explanation:

Volume= surface area

4*22*r*r*r/7*3=4*22*r*r/7

(4/3*4)r³=r² (after pie cancelled)

(1/3)r³ = r²

r³= 3r²

(r/r)(3-2)=3

r = 3

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Answer 2

Step-by-step explanation:

this is for sphere

4/3 * πr3= 4πr2

4/3*1/4=πr2/πr3

1/3=1/r

r=3

hemisphere

2/3 * πr3= 3πr2

2/9=1/r

r=4.5