The area of Circle O is added to its diameter. If twice the circumference of Circle O is then subtracted from this total, the result is 8. What is the radius of Circle O? Choose the correct choice from the following choices
A) 2/π
B) 2
C) 3
D) 4
E) 5
area+diameter-2*circumference=8   pi*r^2+2r=8+2*2pi*r   isolate r and get r(pi*r+2)=8+4pi*r   r=(8+4pi*r)/(pi*r+2) =&gt;4(pi*r+2)/(pi*r+2)   r=4   4
<result>D</result>
The area of Circle O is added to its diameter. If twice the circumference of Circle O is then subtracted from this total, the result is 8. What is the radius of Circle O?