Question

Find the total surface area of right circular cylinder made up of rectangular sheet having area 20 cm² and it's length and breadth are in ratio 3:4.

Answer 1

Answer:

=> 660 sq.m

Step-by-step explanation:

=> L×B = 2πrh

=> 30×22 = 2×22/7×r×30

=>4620/1320=r

=>r=3.5cm

This C. S. A of a cylinder =

2×22/7×3.5×30

=> 660 sq.m