9
QuizMultiple Choice
Equation of a Circle
Question 9 • EAP-Geometry B CR
In the diagram, a circle centered at the origin, a right triangle, and the Pythagorean theorem are used to derive the equation of a circle, x2 + y2 = r2.
Answer
A
(h + x)2 + (k + y)2 = r2B
(x – h)2 + (y – k)2 = r2C
(k + x)2 + (h + y)2 = r2D
(x – k)2 + (y – h)2 = r2