Domain and Range Practice (Part 1): Geometric Identification

This GeoGebra example demonstrates how to determine and label a function’s domain and range using geometric intuition from its graph. The key concepts are Domain (all allowable x-values), Range (all attainable y-values), and how features such as endpoints and open/closed points affect the included intervals. By linking what is visible on the coordinate plane with the corresponding interval notation, learners can translate graphical evidence into precise mathematical statements. Construction-wise, the available build elements indicate the focus on annotation: it uses text objects (text1 and text2) to display the identified domain/range results and guiding notes directly on the figure. Suitable for middle-school to early high-school students learning functions and graphing, as well as for classroom practice, self-study, and interactive instruction.