Question

Which of the equations below describes a circle with radius 7? A. x2 - y2 = 7 B. x2 + y2 = 49 C. x2 + y2 = 77 D. x2 + y2 = 7​

Answer 1

x2-y2=49

Explanation:

the radius is the square root of the number after the equal sign. So the only choice with a number with square root 7 is x2-y2=49