You have school in July?

With analytic geometry.1. How do you know when exactly the locus is a circle, or a parabola, or a straight line, etc? Can someone give me a few tips on this?

Let be an origin. Let be any point. And we want to find the locus of points equidistant from 1 unit. So by the distance formula, thus, . Which is a circle.

Locii3. What is the plural of locus?