Introduction to Circle Equations

This example demonstrates how to draw a circle and display its standard equation using GeoGebra. Core math concepts include the definition of a circle, the standard equation (x-a)²+(y-b)²=r², coordinate geometry, and parametric equations. Key GeoGebra commands used are Intersect, Point, Segment, and OrthogonalLine, with objects like r, c, A, B, a, b, d, e, f, C, g, h, i, D. Suitable for high school students learning about circle equations and their geometric significance.