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
Interactive 2D geometry tool. Select a shape, drag vertices, edit side lengths, and instantly see area, perimeter, angles, and properties. Supports 12 shapes including triangles, polygons, circles, ellipses, and custom shapes. Runs entirely in your browser — no data is sent anywhere.