A is the centre of circle whose radius is 12 units and B is centre of a circle whose diameter is 12 units. If these two circles touch externally, then the area of the circle with diameter AB is?

64 π 81 π 121 π 100 π

81 π

Diameter of new circle with diameter AB is = 18 units Radius of new circle = 9 units Area of new circle = πr2 = π(9)2 = 81π sq. units