2D geometry calculators 📏 calculators

Find the area of a regular ten-sided shape from a known linear measurement, retaining its perimeter and circle radii.

Calculate area and related dimensions for a regular twelve-sided outline with an illustrated radius and apothem guide.

Work between a regular heptagon’s area, side, perimeter, outer radius and apothem using its fixed seven-sided geometry.

Calculate a rectangular area in square feet from dimensions in feet, inches or metric units.

Compare original and scaled rectangle dimensions, including the squared relationship between length scale and area scale.

Find a rectangle’s missing side from its perimeter and the other side, with independent length-unit selectors.

Calculate the area of one rectangular face, or a missing side, with metric and customary area units.

Compute ten-sided regular-polygon measurements, including the four distinct vertex-to-vertex diagonal lengths.

Relate a regular twelve-sided shape’s side, perimeter, area, radii and five distinct diagonal spans.

Connect side length, perimeter and circle radii for a seven-sided regular shape, with its interior and central angles.

Choose any whole side count of at least three and solve regular-polygon measurements from a side, perimeter, area or radius.

Estimate a tightly wound planar spiral length, or calculate the length of one uniform helical turn around a cylinder.