Problema Solution
Find the area of the region that lies outside the circle x sqrd + y sqrd = 4 but inside the circle x sqrd + y sqrd -4y - 21 = 0.
Your answer is ___________.
Answer provided by our tutors
x^2 +y^2 =2^2
x^2 +y^2 -4y-21 =0 --> x^2 +(y-2)^2 = 5^2
S =S1-S2 = pi(5)^2 - pi(2^2) = 21pi = 65.94
The answer is 65.94