Question

the curved surface area of a frustum of a cone is​

Answer 1

CSA or Curved Surface Area of a Cone is

$\boxed{\bold{\pi\:\times\:r\:\times\:l}}$

Where, r is radius of cone.

And l is the slant height of cone.

Since, Frustum is The Bottom part of a Cone. With the top cut off,

Therefore it will have simply two radius.

One is the smaller radius of top and the other will be the bigger one at bottom.

Therefore, We'll simply Replace the radius in formula of cone.

Therefore,

CSA of frustum of cone is,

$\boxed{\bold{\pi\:\times\:(r_{1}+r_{2})\:\times\:l}}$

Where, $r_{1}\:\:and\:\:r_{2}$ are Bigger and smaller radius respectively.

Thanks!

Answer 2

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$\bf\Huge\red{\mid{\overline{\underline{ ANSWER }}}\mid }$

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$\Large\fbox{\color{purple}{QUESTION}}$

SURFACE AREA VOLUME FORMULAS

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$\Large\fbox{\color{purple}{ SOLUTION }}$

$\Large\mathcal\red{FRUSTUM}$

$\Large\mathcal\pink{\implies \: area \: = \pi l(r1 - r2) ^{2} }$

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$\bf\Large\red{ THANKS \: FOR \: YOUR}$

$\bf\Large\red{ QUESTION \: HOPE \: IT }$

$\bf\Large\red{ HELPS }$

$\Large\mathcal\green{FOLLOW \: ME}$

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