Calculate a circle’s circumference easily with formulas based on radius or diameter for quick, accurate results.

Learn how to calculate the perimeter of a parallelogram quickly. Discover the formula and step-by-step method to find the total boundary length.

Calculate the perimeter of a rhombus by adding its four equal sides. Follow our quick guide for simple, step-by-step geometry instructions.

Learn to calculate a trapezoid’s perimeter using simple formulas and clear steps for measuring all side lengths accurately.

Discover how to calculate a regular polygon’s perimeter by multiplying its side length by the total number of sides for an exact measurement.