Question

Find the curved surface area and the total surface area of a cylinder with the following dimensions.

Diameter of the base=21m height=7m​

Answer 1

CSA = 2$\pi$rh

r = 21/2

∴ CSA = 2×22/7×21/2×7

            = 22×21 = 462 m²

TSA = 2$\pi$r (r+h)

        = 2 × 22/7 ×21/2 (21/2+7)

         = 66 × 35/2

         = 33 × 35 = 1155 m²

Answer 2

Here Is Your Answer My Friend ✌️♥️

Diameter = 21m

Radius = 21/2m

Height = 7m

Total Surface Area = 2πr(r + h)

= 2× 22/7×21/7(21/7 + 7)

=44/7 × 21/7(21/7 + 49/7)

= 924/49(70/7)

= 18.857m^2.

Curved Surface Area = 2πrh

= 2 × 22/7 × 21/7 × 7

= 2 × 22 × 21/7

= 44 × 21/7

= 924/7

= 9.247 m^2.

Hope It Helps You...(^_^)

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@Shona..☺️✌️✌️