CPM Homework Help : CCG Problem 12-6

A circle on a coordinate grid, radius 3, center, (0, comma 0). Examine the graph of the circle at right.

Find the equation of the circle.
Hint (a):
Where is the center of the circle?
What is the radius of the circle?
On graph paper, sketch the graph of the equation $x^2 + y^2 = 49$ . What is the radius?

Use the eTool below for help with this problem.
Click the link at right for the full version of the eTool: 12-6 HW eTool