Question

The diameter of the base of a right circular cylinder is 4.2 dm and its height is 1 dm. Find the area of the curved surface in cm^2?​

Answer 1

Given that:

• The diameter of the base of a right circular cylinder is 4.2 dm and its height is 1 dm.

To Find:

• The area of the curved surface in cm²?

Converting dm to cm:

• 1 dm = 10 cm
• Diameter = 4.2 dm = 4.2 × 10 = 42 cm
• Height = 1 dm = 1 × 10 = 10 cm

We know that:

• CSA of cylinder = 2πRh = πDh

Where,

• CSA = Curved surface area
• π = Pie = 22/7
• R = Radius
• h = Height
• D = Diameter = 2R

Finding the CSA of cylinder:

↠ CSA = (22 × 42 × 10)/7

↠ CSA = 1320

Hence,

• The area of the curved surface of a right circular cylinder 1320 cm².

Answer 2

QUESTIONS-:

The diameter of the base of a right circular cylinder is 4.2 dm and its height is 1 dm. Find the area of the curved surface in cm²?​

EXPLANATION-:

Diametre=4.2

Radius=2.1 dm

We know that-:

$\bf\; \leadsto \boxed{\underline{\tt CSA_{(Cylinder)}=2\pi rh}}$

• r=radius=2.1 dm
• h=height=1 dm

Putting values-:

CSA=2×22/7×2.1×1

CSA=132 dm²

     or

CSA=(132×10)cm²

CSA=1320 cm²

∴The curved surface area is 1320 cm²