Multiple choice

It takes 22.6ml to paint the surface of the circular sheet of radius is 23cm. How many ml of paint is required to paint a similar circular sheet with double the radius?

  1. $90.4 ml$
  2. $69 ml$
  3. $34 ml$
  4. $67 ml$
  5. $None of these$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Paint required is proportional to surface area of circular sheet. Area = πr². When radius doubles (from 23 to 46), area becomes 4 times. Paint required = 4 × 22.6 = 90.4 ml.

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