Read the following SAT test question and then click on a button to select your answer.

A circle in the x y-plane has its center at (-100, 221) and a diameter of 17. Which of the following is an equation of the circle?

A.(x+100)²+(y-221)²=72.25
B.(x+100)²+(y-221)²=289
C.(x-100)²+(y+221)²=72.25
D.(x-100)²+(y+221)²=289

来源:可可英语 http://www.kekenet.com/sat/201704/504694.shtml