Question

The curved surface area of a right circular cylinder of radius 2r and height 2h is
opyions are-
44/7 rh
88/7 rh
176/7 rh
none of these

Answer 1

Given:

$\star \bold{ \:radius \: = 2r} \\ \\ \star \bold{ \: height = 2h}$

To find :

$\star \: \bold{curved \: surface \: area \: of \: cylinder.}$

Solution:

• As we know that :

$\star \boxed{ \bold{ curved \: \: surface \: area \: of \: cylinder = 2\pi \: rh}}$

•Put the values of radius and height :

$\implies \: 2\pi \: r \: h \\ \\ \implies \: 2( \frac{22}{7} )(2r)(2h) \\ \\ \implies \: \frac{176}{7} rh$

Hence , the CSA of cylinder is 176/7 rh .

option c is correct .

Answer 2

Given:-

• Radius of cylinder = 2r.
• Height of cylinder = 2h.

To find:-

• Curved surface area.

SolutioN:-

As we know that,

☘ Curved surface area of cylinder = 2πrh

In which

• 'r' is Radius of cylinder
• 'h' is height of cylinder.

☆ Radius = 2r

☆Height = 2h

Now, Put Radius and height of cylinder in above formula.

⇒2 × 22/7 × 2r × 2h

⇒44/7 × 4rh

⇒176/7 rh

Therefore,

❛Curved surface area of cylinder is 176/7 rh.❜