If the diameter of a circle is increases by 15%, then what will be th…

15% = \(\frac{3}{20}\)

Diameter        20     :      23

Radius            20     :      23

Area              20²    :      23²

                    400     :     529      ⇒ 129 (diff.)

Percentage change in area = \(\frac{129}{400}\) × 100 = 32.25%