The radius of a circle is increased by 2

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Target Exam

CUET

Subject

General Test

Chapter

Quantitative Reasoning

Topic

Mensuration: 2D

Question:

The radius of a circle is increased by 20%, then area increased by?

Options:

50%

44%

20%

remains unchanged

Correct Answer:

44%

Explanation:

Using the formula for net effect = x% + y% + $\frac{x\;× \;y}{100}$ %

⇒ Net Effect = 20% + 20% + $\frac{20\;×\;20}{100}$% = 44%