When the diameter of a circle is trebled, the area is multiplied by how many times?

A    3

B    6

C    9

D    12

Solution

Correct Answer: Option C

 

If the diameter of a circle is trebled, the radius is trebled too.

Now,

The radius is squared when used to derive the Area of a circle. Thus, If radius is multiplied by 3, the area will be multiplied by (3)2 times, or 9 times

 

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