Area of the sheet used to make the tank = total surface area of the cylinder = 2r(r+h) = 2 x 22/7 x 63 x 263 = 104148 sq. cm.
Here a tip : if the top number is less then half of the bottom number, then it is less then 1/2.
less then 1/2 : 1/4, 1/5, 2/12
to be greater then 1, the top number must be bigger then the bottom number
greater then 1 : 6/5, 14/8, 11/10
Answer: r<2
Step-by-step explanation:
r-5+5<-3+5
Cancel out,
r<2