Question

3. Find the curved surface area and total surface area of a right circular
cylinder whose height and radius of the base are 20 cm and 7 cm
respectively.​

Answer 1

Answer:

Radius of cylinder (r)=7cm

Height of cylinder (h)=15cm

Curved Surface Area =2πrh

=2×(22/7)×7×15

=660cm

2

Total Surface Area =2πr(h+r)

=2×(22/7)×7(15+7)

=2×22×22

=968cm

2

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Answer 2

Step-by-step explanation:

Curved surface area of cylinder is 2πrh

= 2 ×3.14 × 7 ×20 = 879.2 cm^ 2

and total surface are = curved surface area + 2(circular base area)

= 879.2 + 2( 3.14 × 7^2) = 879.2 + 307.72 = 1186.92 cm^ 2

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