Plane Geometry Calculators
2D shapes: circles, rectangles, triangles and more
14 calculators in this section
Circle Calculator
Area, circumference, diameter and radius
Rectangle Calculator
Area, perimeter and diagonal of rectangles
Square Calculator
Area, perimeter and diagonal of squares
Right Triangle Calculator
Solve right triangles with Pythagorean theorem
Pythagorean Theorem
Find sides of right triangles
Parallelogram Calculator
Area and perimeter of parallelograms
Rhombus Calculator
Area and perimeter of rhombuses
Regular Polygon Calculator
Properties of regular polygons
Annulus Calculator
Area of ring/annulus shapes
Slope Calculator
Find slope between two points
Midpoint Calculator
Find midpoint between two points
Distance Calculator 2D
Distance between two points in 2D
Law of Sines
Solve triangles with law of sines
Law of Cosines
Solve triangles with law of cosines