Question

The radius of the base of a right circular cylinder is14. cm.
and its height is 40 cm. find the (1) circumference of the base
The curved surface area and the total surface area.​

Answer 1

Area of Base of cylinder = 81π

as Area of base = πr

2

⇒πr

2

=81π

r

2

=81

r=9cm

Height = 14 cm

CSA of cylinder = 2πrh

=2×π×9×14

=2×

7

22

×9×14

=22×36=792cm

2

Answer 2

Answer:

(I) 88 cm

(II) CSA= 3520cm²

(III)TSA = 24640 cm²

Step-by-step explanation:

(I) circumference = 2 π r = 2 X 22/7 X 14 cm

= 88 cm

(II) CSA = 2 π r h = 2 X 22/7 X 14 cm X 40 cm

= 3520 cm²

(III) TSA = π r² h = 22/7 X 14 cm X 14 cm X 40 cm

= 24620 cm²