Circle Equations with Sliders (Center-radius form)

This example dynamically demonstrates the standard equation of a circle (x-h)²+(y-k)²=r² using sliders to show how changes in the center (h,k) and radius r affect the circle. Core math concepts include the standard circle equation, coordinate geometry, and parameter variation. It uses GeoGebra commands like Intersect with objects such as circle c, point A, texts text1/text2, variables h/k/r/d, point B, and texts text3/text4. Suitable for high school students learning about circle equations and their geometric interpretations, as well as parameterized demonstrations.