Question

solve this question​

Answer 1

surface area of sphere=394.24cm^2

let The radius of bigger sphere be R

surface area of bigger sphere=4

$\pi$

rR^2

394.24=4*22/7*R^2

394.24*7/22*4=R^2

R^2= 31.36

R=5.6cm

25% of R= radius of smaller sphere(r)

25/100*5.6=r

r=1.4cm

surface area of smaller sphere=4

$\pi$

r^2

=4*22/7*1.4*1.4

=24.64cm^2

decrease in surface area=394.24-24.64

=369.6cm^2