Rachii Cycle

Build your own circles, place points, and connect lines. Rachii Cycle is an interactive geometry workspace for teachers and learners on iPad and iPhone. • Sketch circles or lines with Apple Pencil on a compatible iPad, or draw with your finger. Recognized strokes can become clean geometric objects. • Construct points, connecting lines, tangents, intersections, and regular polygons. Selected objects stand out clearly. • Measure angles automatically, display right-angle squares, rename angles, and lock selected angles to actual whole-degree values. • Discover supported circle properties with explanations based on the current construction and its conditions. • Explore 23 lessons covering semicircles, central and inscribed angles, cyclic quadrilaterals, tangents, chords, polygons, circumference, area, and power of a point. • Follow proofs step by step, copy lessons, and create your own properties. • Save work locally and export editable projects, PDF documents, or PNG images. Switch between Thai, English, Simplified Chinese, Korean, and Japanese. Lessons, drawing, and saving work offline. No account, ads, in-app purchases, or subscription. Measurements are approximate, and exploration is not a proof. Automatic property detection is limited to supported constructions and conditions. Angles dependent on a locked angle may remain fractional. Apple Pencil requires a compatible iPad and Pencil model; use your finger on iPhone.