Question

The surface area of two hemispheres are in the ratio 64: 121. Find the ratio of their radii

Answer 1

Answer:

5:7

Step-by-step explanation:

Let the radius of first hemisphere be 'r' units

Let the radius of second hemisphere be 'R' units

2 x \piπ x r^2 / 2 x \piπ x R^2 = 25 / 49

r^2 / R^2 = 25 / 49

r / R = 5 / 7

the ratio of radii is 5:7.

Answer 2

answer:

R : 8 , R: 11

explaination:

CSA OF HEMISPHERE IS  ; 2$\pi$r2

CSA  of 1st hemisphere is in ratio of 2nd one

2$\pi$r2:2$\pi$r2

then 2 and pi will be cancelled rest is  '' r ''square.

then find the squares of their 64 and 121

which 64= 8

121= 11