Question

A closed circular cylinder has diameter 20 cm and height 30 cm . Find the total surface area of the cylinder ( π = 3.14) *

Answer 1

Answer:

Diameter of cylinder = 20 cm

so the radius = 20/2 = 10 cm

Height = 30cm

Total surface area of the cylinder =2πr(h+r)

                                                      = 2 × 22/7 ×10 (30+10)

                                                      = 440/7 × 40

                                                      = 17600/7

                                                      =2514.28 cm²

Answer 2

$\huge\mathbf{Answer}$

Diameter = 20cm

$\therefore Radius\:=\:10cm$

Total Surface area = 2πR (r + h)

‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ = 2 × 3.14 × 10 ( 10 + 30 )

‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ = 20 × 3.14 (40)

‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ ‎‎ = 314 × 8

‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ ‎‎‎ = 2512

$\mathtt\therefore\:T.S.A\:of\:Cylinder\:is\:2512cm^2$