Question

Solve this problem please do it fast explain me how to solve it

Answer 1

338pie =2 pie×Rh +2pie×rh+2pie(R^2-r^2)

338pie=2pie(Rh+rh+(R^2-r^2))

169=8×10 +10×r +64-r^2

169-144=10r-r^2

25=10r-r^2

r^2-10r+25=0

r(r-5)-5(r-5)=0

therefore r=5

therefore thickness =(8-5)=3