Circle area, circumference, and properties
Solve the six circle theorems in one tool: inscribed angle, Thales, cyclic quadrilateral, equidistant chords, intersecting…
Calculate the length of the tangent from an external point to a circle with l = √(d²−r²). Enter the radius and the distance…
Find the standard equation of a circle (x−h)²+(y−k)²=r² from center and radius or from 3 points. Get the general and parametric…
Find the largest square inside a circle, the largest circle inside a square, or a square/circle with the same area. Supports…
Calculate the area of a circular segment, chord length, arc length, and sagitta. Enter radius with central angle or chord…
Calculate the area of a circle using radius or diameter. Supports metric (mm, cm, m, km) and imperial (in, ft, yd, mi) units.…
Calculate the arc length and sector area of a circle. Enter radius (or diameter) and central angle. Supports metric and imperial…
Calculate circle circumference, diameter, radius, and area. Works in all directions - enter any value to get all circle properties…
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