Double-click a side to add a vertex
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Area
8313.60 mm²
Perimeter
416 mm
Classification
Equilateral triangle
Sides
ABmm
BCmm
CAmm
Angles
A60.0°B60.0°C60.0°
Properties
Convexity
Convex
Regularity
Regular
Angle sum
180°
Diagonals
0
Circumscribed R
80 mm
Inscribed R
40 mm
Geometry Calculator
Free interactive 2D geometry calculator. Select from 11 shapes — triangle, square, circle, ellipse, pentagon, hexagon, octagon, diamond, trapezoid, parallelogram, and star — then drag vertices on an interactive SVG canvas to see area, perimeter, angles, and side lengths update in real time. Features include snap-to-grid, zoom and pan, unit conversion (mm, cm, m for lengths; mm², cm², m², km² for areas), SVG export, and clipboard copy. Runs entirely in your browser — no data is sent anywhere.