Question

A cylindrical pillar has radius 21 cm and height 4m find the curved surface area of piller

Answer 1

$\Huge{\boxed{\mathfrak{HELLO \:Mate}}}$

$\bold{Curved\:surface\: area\:of\:cylinder\:=\:2πrh}$

$= 2 \times 3.14 \times 21 \times 400 = 52752c {m}^{2}$

C. S. A of pillar = 52752cm²

$\huge{\bold{\boxed{Hope\:it\:helps\:you!}}}$

Answer 2

as we all know the c.s.a of the cylinder is 2πrh

then convert h = 4 m = 400 cm

thus c.s.a of cylinder = 2*22/7*400*21 = 52800cm ²