Question

A cylindrical drum has a height of 20 cm and base radius of 14 cm. Find its

curved surface area and the total surface area.​

Answer 1

Answer:

hope this is clear enough!

Answer 2

Answer :

›»› The curved surface area of cylinder is 1760 cm².

›»› The total surface area of cylinder is 2992 cm².

Given :

• A cylindrical drum has a height of 20 cm and base radius of 14 cm.

To Find :

• Curved surface area of cylinder.
• Total surface area of cylinder.

Solution :

• Radius = 14 cm.
• Height = 20 cm.

As we know that

→ CSA of cylinder = 2πrh

→ CSA of cylinder = 2 * 22/7 * 14 * 20

→ CSA of cylinder = 2 * 22 * 2 * 20

→ CSA of cylinder = 44 * 2 * 20

→ CSA of cylinder = 88 * 20

→ CSA of cylinder = 1760

Hence, the curved surface area of cylinder is 1760 cm².

As we know that

→ TSA of cylinder = 2πrh + 2πr

→ TSA of cylinder = 2πr(h + r)

→ TSA of cylinder = 2 * 22/7 * 14(20 + 14)

→ TSA of cylinder = 2 * 22/7 * 14 * 34

→ TSA of cylinder = 2 * 22 * 2 * 34

→ TSA of cylinder = 44 * 2 * 34

→ TSA of cylinder = 88 * 34

→ TSA of cylinder = 2992

Hence, the total surface area of cylinder is 2992 cm².

Extra Brainly Knowledge :

• Volume of cylinder = πr²h.
• TSA of cylinder = 2πrh + 2πr².
• Volume of cuboid = l * b * h.
• CSA of cuboid = 2(l + b)h.
• TSA of cuboid = 2(lb + bh + lh).
• CSA of cube = 4a².
• TSA of cube = 6a².
• Volume of cube = a³.

Where,

• The value of π is 22/7 or 3.14.
• r is the Radius.
• h is the Height.
• l is the Length.
• b is the Breadth.
• a is the Side.