Question

find the curved surface area of a right circular cylinder of base radius 5cm and height 21cm...​

Answer 1

Given

• Radius of cylinder = 5cm
• Height of cylinder = 21cm

Find out

• Curved surface area of cylinder

Solution

As we know that

✞Curved surface area of cylinder

➟ 2πrh

➟ 2 × 22/7 × 5 × 21

➟ 2 × 22 × 5 × 3

➟ 22 × 30

➟ 660 cm²

Hence curved surface area of cylinder is 660 cm²

Additional Information

• T.S.A of cylinder = 2πrh + 2πr²
• Volume of cylinder = πr²h
• Volume of cube = a³
• Volume of cone = ⅓ πr²h
• Volume of cuboid = l × b × h
• C.S.A of cone = πrl
• T.S.A of cube = 6a²
• C.S.A of cube = 4a²
• T.S.A of cuboid = 2(lb + bh + lh)
• C.S.A of cuboid = 2(l + b)h

$\rule{200}3$

Answer 2

$\sf{\large{\red{\underline{\purple{Question:-}}}}}$

find the curved surface area of a right circular cylinder of base radius 5cm and height 21cm.

$\sf{\large{\red{\underline{\purple{Given:-}}}}}$

• $\sf Base\: radius=5cm$
• $\sf Height = 21cm$

$\sf{\large{\red{\underline{\purple{To\: Find-}}}}}$

• $\sf Curved\:surface\:area=?$

$\sf\large{\red{\underline{\purple{FORMULA\:U SED:-}}}}$

$\sf\large{\fbox{\red{\underline{\blue{C.S.A\:of\: Cylinder=2πrh}}}}}$

$\sf{\large{\red{\underline{\purple{Solution:-}}}}}$

$\sf→ C.S.A= 2πrh\\\sf→ C.S.A= 2×\frac{22}{7}×5×21\\\sf→ 44×15\\\sf→ {\fbox{\red{\underline{\pink{660cm^2}}}}}$