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?
Answer & explanation
Correct answer: option 2
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