Geometry Tools

Calculate area and perimeter of rectangles, triangles, parallelograms, trapezoids, and circles with SVG visuals and step-by-step formulas.

Visualize complementary, supplementary, vertical angles, and parallel lines with transversals. Color-coded equal angle pairs.

Explore 15 classical geometry constructions step by step. Watch animations, drag points, and try constructions yourself.

Explore circles, ellipses, parabolas, and hyperbolas with interactive graphs, equations, foci, and tangent lines.

Calculate surface area and volume for 12 three-dimensional shapes with interactive SVG 3D diagrams, step-by-step KaTeX formulas, and real-world presets.

Five modes for distance and midpoint, slope and line equations, parallel and perpendicular lines, circle equations, and triangle properties. Interactive JSXGraph plot with special points.

Visualize translations, rotations, reflections, dilations, and compositions on a coordinate plane. See original and transformed shapes side by side with JSXGraph.

Solve for any missing side with step-by-step math, see the visual proof with colored squares on each side, generate Pythagorean triples, and extend to 3D distance.

Explore six circle theorems with interactive JSXGraph diagrams. Inscribed angles, tangent-radius, arc length, sector area, chord properties, secant-tangent, and cyclic quadrilaterals.

Calculate and visualize properties of regular polygons from 3 to 20 sides. SVG diagram with interior angles, diagonals, area, perimeter, apothem, and circumradius.

Step-by-step proofs for 18 theorems across 4 categories: Parallel Lines, Triangle Theorems, Congruence and Similarity, and Circle Theorems. SVG diagrams highlight the relevant element at each step.

Input triangle measurements and verify congruence or similarity via SSS, SAS, ASA, AAS, HL, AA, SSS~, and SAS~ criteria. SVG overlay renders both triangles to scale.

Select a 3D shape, adjust dimensions with sliders, and see the unfolded net SVG with color-coded faces. Computes surface area formula and value for cube, prism, cylinder, cone, pyramid, and triangular prism.

Click to build shapes on a grid and see area and perimeter update live. Explore how shapes with the same area can have different perimeters. Rectangle mode with formulas

Pack rectangular prisms with unit cubes in an isometric 3D view. Count by layers and connect to the volume formula V = l × w × h

Find lines of symmetry in shapes, create mirror drawings on a pixel grid, and explore pattern block compositions. Visual geometry for elementary students

Drag rays to build angles, classify as acute/right/obtuse/straight/reflex, overlay a protractor to measure, and play angle-matching challenges

Classify 2D shapes by sides, angles, parallel lines, and symmetry. Explore the quadrilateral family tree with sorting games and true-or-false quizzes.

Measure angles with an interactive protractor, decompose angles into two parts, and solve unknown-angle puzzles. Explore right angles, straight angles, and full turns.

Explore how 2D nets fold into 3D shapes. Count faces, edges, and vertices. Match nets to cubes, prisms, pyramids, and more. Grades 3-5.