Question

find the curved surface area and total surface area of a right circular cylinder whose hight and radius of the base are 20 cm and 70 cm​

Answer 1

✰given ,

r = 70cm

h = 20cm

____________________________

$\huge\underline{\mathbb\red{✰A}\green{N}\mathbb\blue{S}\purple{W}\mathbb\orange{E}\pink{R}}\:$,

surface area of a cylinder => 2πrh

so, 2× $\frac{22}{7}$× 20 × 70

=> 200 × 44 => 8800cm2

and, total area is 2πr ( r + h )

=>. 2 × $\frac{</em><em>2</em><em>2</em><em>}{</em><em>7</em><em>}$×70×[ 70+ 20 ]

=>. 440 [ 90 ]

=>. 39600cm2