Plane geometry refers to the subcategory of geometry that considers figures in a plane. Wolfram|Alpha can answer your questions about figures in a plane such as circles, angles, polygons, etc.
Compute properties of a simple plane figure.
Compute properties of a triangle, quadrilateral or regular n-gon.
Compute the complement, supplement and reference angles in both degrees and radians.
Compute properties for planar laminae.
Step-by-Step Solutions for Geometry
Compute side lengths of golden rectangles.