Question

16. The radius of a herispherical baloon increases from
bem to 12cm as air is being proped into it. the ratio
of the surface areas of the baloon in the two cases
a) 1:4
b)1:3
c) 2:3
d )2:1​

Answer 1

Answer:

a) 1:4

Step-by-step explanation:

Total surface area of a Hemisphere

= 2πr2 +πr2

= 3πr2

r=6, Surface area = 3π(6)2 = 36

r=12, Surface area =3π(12)2 = 144

Ratio = 36:144

=1:4

Hope you like it.... make me brainliest.... ヾ(¯∇￣๑)ヾ(¯∇￣๑)