If the radius of a circle is reduced by 15%, then its area is reduced by:

Correct option is D

Given:

The radius of the circle decrease =  15%, 

​Formula Used:  

( a + b + $$\frac{ab}{100}$$)% 

Solution:  

(-15 -15 + $$\frac{-15\times-15}{100}$$)%

= (-30 + 2.25 )%

= -27.75 %

Then the area of the circle decreased by 27.75%