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## Math - Geometry Lesson Plans : Surface Area of Cylinders

Mensuration - Solve each exercise problem related to surface area of cylinders given below.

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 1. Find the total surface area (in cm2) of an metallic pipe (open at both ends) of external diameter 28 cm, internal diameter 7 cm and length 40 cm. .fixedToBottom { position:fixed; _position:absolute; right:0; bottom:2; _top:expression(document.body.scrollTop+document.body.clientHeight-this.clientHeight - 256); } Hint 2. A metallic pipe (open at both ends) 40 cm long has an external diameter of 50 cm. The thickness of the metallic pipe is 2 cm. Find the total surface area (in cm2) of the metallic pipe. Hint 3. Find the curved surface area (in cm2) of a cylinder of diameter 28 cm and height 40 cm. Hint 4. Find the total surface area (in cm2) of a cylinder of radius 3.5 cm and height 55 cm. Hint 5. A hollow cylinder (open at both ends) has an external diameter of 14 cm, length of 14 cm and thickness of 1 cm. Find its total surface area (in cm2 upto two decimal places). Hint 6. The total surface area of a cylinder of radius 7 cm is 1848 cm2. Find the height (in cm) of the cylinder. Hint 7. A road roller of diameter 98 cm has a length of 125 cm. It makes 4000 complete revolutions in order to level a field. Find the cost (in \$) of leveling it at 4 cents per square meter. Hint

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