The area of a circle is added to its diameter, and the circumference is then subtracted from this total, the result is 10. What is the radius of the circle?	Choose the correct choice from the following options
A) 2*pi	B) pi	C) 2	D) 4*pi	E) 4
The equation is; diameter + Area - Circumference = d + A - C = d + pi * r^2 - 2 * pi * r = 2r + pi * r(r - 2).   By plugging in the answers we can test the answers quickly; then, 4 is the only possible answer.   Answer: 4
<result>E</result>
The area of a circle is added to its diameter, and the circumference is then subtracted from this total, the result is 10. What is the radius of the circle?