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