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Area of any regular polygon by sides and radius. Formula, variable legend, diagram and worked example included. Instant geometry result.

Radius of inscribed circle in a triangle. Formula, variable legend, diagram and worked example included. Instant geometry result.

Radius of circumscribed circle of a triangle. Formula, variable legend, diagram and worked example included. Instant geometry result.

Calculate triangle area from three side lengths using Heron's formula. Enter sides a, b, c — see area, semi-perimeter, and angle calculations. Free.

Area of a circular sector by radius and angle. Formula, variable legend, diagram and worked example included. Instant geometry result.

Arc length from radius and central angle. Formula, variable legend, diagram and worked example included. Instant geometry result.

Calculate chord length for any circle, given radius and central angle. Enter radius and angle — see chord length with arc length and sector area. Free.

Area of a ring between two concentric circles. Formula, variable legend, diagram and worked example included. Instant geometry result.

Calculate the area, perimeter, and diagonal lengths of a kite. Enter diagonals or side lengths — see all properties. Free.

Radius of incircle in a triangle. Formula, variable legend, diagram and worked example included. Instant geometry result.

Area arc length and perimeter of a sector. Formula, variable legend, diagram and worked example included. Instant geometry result.

Find triangle area from three side lengths. Enter a, b, c — see area via Heron's formula with s = (a+b+c)/2 clearly shown. Free.