Google Classroom
GeoGebraGeoGebra Classroom

Circles

Introduction

The standard equation of a circle is given by: This should remind you of the pythagorean theorem:

Descriptions

Note that when a circle equation contains a negative, h and k are actually positive values. for the circle , the center of the circle would be (h,k)=(5,-2), with a radius of 4, since Now use the geogebra applet to see how manipulating the center and radius of a circle changes the equation of a circle in real time.