Question

A cone has a cicular base of radius 10cm and slant height of 30cm.calculate the surface area? explain Step by step. ​

Answer 1

Step-by-step explanation:

GIVEN : r = 10 cm

l = 30 cm

Solution :

C.S.A of a cone =

$\pi \: rl$

= 22/7 × 10 × 30

= 6600/7

= 942.8 sq.cm

T.S.A of a cone =

$\pi \: r \: (r + l)$

= 22/7 × 10 ( 10 + 30 )

= 220/7 (40)

= 8800/7

= 1257.1 sq.cm

Answer 2

Step-by-step explanation:

$r=10cm\\l=30cm$

Formula :

$\implies$ $Surface\:Area=πr^2+πrl$

$\implies$ $S.A=π×r(r+l)$

$\implies$ $S.A= 3.14×10(10+30)$

$\implies$ $S.A=31.4(40)$

$\implies$ $\boxed{S.A=1256\:Cm^{2}}$

$\implies$ $Curved\:Surface\:Area=πrl$

$\implies$ $CSA=3.14×10×30$

$\implies$ $\boxed{CSA=942\:Cm^{2}}$

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