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Multiple choice

If the radius of circle is increased by 60%, then the area of circle increases by:

  1. 156 %

  2. 289 %

  3. 125 %

  4. 196 %

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When radius increases by 60%, new radius = 1.6r. New area = π(1.6r)² = 2.56πr². Original area = πr². Increase = 2.56πr² - πr² = 1.56πr², which is 156% of the original area.

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