Question

the center of a circle is at the orgin. an endpoint of a diameter is at (-3,-4). how long is the diameter of the circle?

Answer 1

Use the distance formula to find the distance between (-3,-4) and (0,0). That'll give you the radius, which you can then use to get the diameter.\[d=\sqrt{(x_{2}-x_{1})^{2}+(y_{2}-y_{1})^{2}}\]