Question

9. The diameter of the base of a rightcircular
cylinder is 42 cm and the height is 10 cm.
Find its curved surface area.​

Answer 1

Step-by-step explanation:

Given:

1. diameter of the base of a right
2. cylinder is 42.
3. radius is d/2, r=42/2=21cm.
4. Height = 10 cm.

To find: CSA of cylinder.

Formula: CSA of cylinder=2πrh.

=> 2×22/7×21×10

=> 44×30

=> 1320cm².

Answer 2

Given :

• The diameter of the base of a right circular cylinder is 42 cm and the height is 10 cm.

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Find :

• What is the curved surface area.

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Concept :

• To solve this question, we can use "CSA formula". CSA stands for Curved surface area formula. This concept is form the chapter "Measurements".

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Applying formula :

★ CSA = 2πrh.

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Know terms :

• π = pie.
• r = radius.
• h = height.
• Remember that the approximate value of π is 22/7.

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Calculations :

→ (22/7) × (42) × 10

→ 132 × 10

→ 1320 cm²

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Therefore, 1320 cm² is the curved surface area.