Question

20. Find the curved surface area of a cylinder with diameter 21 cm and height 15 cm.​

Answer 1

Answer:

Solution A=2πd

2h+2π(d

2)2=2-TT-21

2.15+2-TT-(21

2)2-1682.32287cm²

Answer 2

C.S.A of cylinder =1320 cm

2

44

d=21 cm

r=10.5 cm

h=?

C.S.A =1320

=2πrh=1320

=2× 22/7 ×10.5×h=1320

⇒h=

1320/60

=

20=h

h=20 cm