SOLUTION: The area of a circle with a radius of 2 is how much less than the area of a circle with radius 4? (a)2π (b) 4π (c) 8π (d) 12π (e) 16π

Algebra ->  Circles -> SOLUTION: The area of a circle with a radius of 2 is how much less than the area of a circle with radius 4? (a)2π (b) 4π (c) 8π (d) 12π (e) 16π       Log On


   

Question 343361: The area of a circle with a radius of 2 is how much less than the area of a circle with radius 4?
(a)2π (b) 4π (c) 8π (d) 12π (e) 16π
Answer by nyc_function(2741) About Me  (Show Source):
You can put this solution on YOUR website!
We use A = pir^2 TWICE.
Area of big circle - area of litle circle
16pi - 4pi = 12pi
The answer is choice (d).