Ryan’s teacher asked him to graph circle E with equation (x – 5)2 + y2 = 25. Below is the graph he submitted.


Circle E that contains points 30, 0; 5, negative 25; negative 20, 0; 5, 25.

What, if anything, did Ryan do wrong when graphing this equation?

1 answer

His circle satisfies

(x-5)^2 + y^2 = 25^2

not just 25.