Question

find the area of right circular cylinder if circumference of base=1.32m,height=25cm​

Answer 1

As, circumference of base = 1.32m
2πr = 1.32
πr = 1.32/2
r = 0.66 *7 / 22
r = 0.3 *7 / 2
r = 2.1/2
r = 1.05m
and as, h = 25 cm = 0.25m
and now area(CSA) = 2πrh
CSA = (2 * 22 * 1.05 * 0.25)/7
CSA = 11.55/7
CSA = 1.65 m square
.
Now TSA = 2πr (h+r)
TSA = 2*22*1.05 / 7 (0.25 + 1.05)
TSA = 46.2/7 (1.3)
TSA = 6.6 * 1.3
TSA = 8.58 m square