Triangle Sketch

Draw, edit, and explore triangles with side lengths, angles, coordinates, height, circles, area, perimeter, and trig tools.

Triangle Sketch is a hands-on geometry tool for drawing and exploring triangles.

Draw a triangle with your finger, check its measurements, edit side lengths and angles, move vertices, enter coordinates, and view useful triangle facts. Triangle Sketch helps students see how triangle measurements connect instead of only reading formulas.

Features: • Draw triangles directly on a graph • Edit side lengths, angles, and vertex coordinates • Work with any triangles and right triangles • View area, perimeter, triangle type, height, centroid, incircle, and circumcircle • Use right-triangle trig tools • Change units, decimals, colors, grid snapping, and display options • One-time hints help students discover important tools

Triangle Sketch is designed for students, teachers, and anyone learning geometry.