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Surface Area and Volume of Right Circular Cylinder | Surface Area and Volume of Right Circular Cylinder Exercise 22.1

Question 5

A rectangular strip 25 cm × 7 cm is rotated about the longer side. Find thetotal surface area of the solid thus generated.

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We have,

Dimension of rectangular strip = 25 cm × 7cm

When this strip is rotated about its longer side,

Height of cylinder becomes = 25 cm

Radius = 7 cm

∴ Total surface area of cylinder = 2πr (h+r)

= 2 × 22/7 × 7 (25 + 7)

= 2 × 22/7 × 7 × 32

= 1408 cm2

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subject-cta

Question 5

A rectangular strip 25 cm × 7 cm is rotated about the longer side. Find thetotal surface area of the solid thus generated.

Looking to do well in your science exam ? Learn from an expert tutor. Book a free class!

We have,

Dimension of rectangular strip = 25 cm × 7cm

When this strip is rotated about its longer side,

Height of cylinder becomes = 25 cm

Radius = 7 cm

∴ Total surface area of cylinder = 2πr (h+r)

= 2 × 22/7 × 7 (25 + 7)

= 2 × 22/7 × 7 × 32

= 1408 cm2

Our top 5% students will be awarded a special scholarship to Lido.

subject-cta
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