Geometry Handbook

Build with compass and straightedge, explore theorems with proofs, and solve geometry problems with to-scale drawings. A handbook for learning by doing.

Geometry Handbook is a geometry workbench for school: build constructions with compass and straightedge, solve triangles and solids with a to-scale drawing, and explore theorems and proofs. The handbook and geometry tools work offline.

CONSTRUCTION LAB A dynamic geometry board. Place points, draw segments, lines, rays and circles, use the compass, construct perpendiculars, parallels, midpoints, angle bisectors, perpendicular bisectors, intersections and polygons. Drag any free point and everything built from it follows. Lengths, angles and areas are measured live on the drawing. Undo, redo, zoom and pan.

13 CLASSIC CONSTRUCTIONS, STEP BY STEP The midpoint of a segment, the perpendicular bisector, the angle bisector, perpendiculars and a parallel line, copying an angle, a triangle from three sides, the circumscribed and inscribed circles, the Euler line, tangents from a point and the regular hexagon. Each step is explained; drag the given points to explore the construction.

SOLVER WITH STEPS Solve a triangle from supported combinations of sides and angles: SSS, SAS, ASA, AAS and SSA, including the ambiguous case with two solutions. Right triangles, regular polygons, circles, arcs, sectors and segments, and the volume and surface area of cubes, boxes, cylinders, cones, spheres, pyramids and frustums. Every answer comes with a drawing to scale, and impossible data gets a clear explanation of why. With Pro, every value is derived step by step: the formula, the numbers substituted and the result.

THE HANDBOOK 184 entries in 21 topics of plane and solid geometry. Each has a precise statement, an illustration, a worked example and the common mistakes. 152 proofs and derivations, 144 calculators, 368 check-yourself questions, a cheat sheet, exact trigonometric values, notation and a problem-solving guide.

AI TUTOR ON YOUR DEVICE Ask about a theorem or a problem in your own words, or open the tutor from an article to ask about that topic. Scan a problem with the camera or pick a photo. The tutor uses Apple Intelligence on your device; questions and photos stay on it. AI tutoring requires iOS/iPadOS 26 or later on a compatible device with Apple Intelligence enabled and its model ready. AI answers can contain mistakes. The tutor uses a language supported by Apple Intelligence, on-device Apple Translation where available, or English with a short note.

FREE AND PRO Free: the whole handbook with drawings, proofs, calculators and the cheat sheet; Solver answers with drawings; three guided constructions; three practice rounds a day. Geometry Pro adds the freeform construction board, all 13 guided constructions, step-by-step Solver solutions, the AI tutor and problem scanner, and unlimited practice. Monthly and yearly plans are auto-renewing subscriptions; manage or cancel them in App Store settings. Lifetime is a one-time purchase with no automatic renewal.

48 LANGUAGES The interface and handbook are available in 48 languages, offline. Arabic, Hebrew and Urdu read right to left. AI replies use your language when supported, on-device Apple Translation when available, or English with a short note.

WORKS WITH UNLOCKY Read three handbook cards and pass a quick check to earn screen time in Unlocky. Requires a version of Unlocky that supports study breaks.

No account, no ads, no tracking. Light and dark themes, iPhone and iPad.

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