Geometry Calculators

Areas, perimeters and angles of plane shapes: triangles by every common method, Pythagoras, Heron’s formula, rectangles, squares, circles and sectors, ellipses, trapeziums and regular polygons.

Pythagorean Theorem Calculator

Missing side of a right triangle.

Triangle Area Calculator

Triangle area three ways.

Heron’s Formula Calculator

Triangle area from three sides.

Triangle Angle Calculator

Triangle angles from sides or two angles.

Equilateral Triangle Calculator

Area, height and radii from the side.

Rectangle Calculator

Area, perimeter and diagonal of a rectangle.

Square Calculator

All measures of a square from any one.

Circle Calculator

All measures of a circle from any one.

Sector Calculator

Sector area, arc, chord and segment.

Ellipse Calculator

Area, perimeter and eccentricity of an ellipse.

Trapezoid Calculator

Area of a trapezium.

Polygon Calculator

Regular polygon area, angles and diagonals.