If radius of a circle is increased by 15%, then the increase in its area is:
Answer & explanation
Correct answer: option 4
Total increased % in area = r% + r% + \(\frac{r × r}{100}\) %
= 15% + 15% + \(\frac{15× 15}{100}\)%
=30% + 2.25% ⇒ 32.25%
If radius of a circle is increased by 15%, then the increase in its area is:
Correct answer: option 4
Total increased % in area = r% + r% + \(\frac{r × r}{100}\) %
= 15% + 15% + \(\frac{15× 15}{100}\)%
=30% + 2.25% ⇒ 32.25%