A circle centered at the origin runs through the point negative 6 and a positive 8 What is the radius of the circle?

1. Draw a coordinate grid.

2. Put the point (-6, 8) on the grid.

3. Notice you can draw a right triangle. (From origin go 6 left. Make a point. Then go 8 up)

5. Use pythagorean theorem to find hypoteneuse.

6. 62 + 82 = r2