Solves all twenty one cases when given any two inputs. This calculator calculates for the radius, length, width or chord, height or sagitta, apothem, angle, and area of an arc or circle segment given any two inputs. Please enter any two values and leave the values to be calculated blank. There could be more than one solution to a given set of inputs. Please be guided by the angle subtended by the arc. If the angle is greater than 180 degrees then the arc length described is greater than the arc length of a semi-circle (Click here for illustration). More length units have been added. The length unit choices are feet (ft), inch (in), meter (m), centimeter (cm), millimeter (mm), yard (yd), kilometer (km), mile (mile). The angle unit choices are degree (deg), radian (rad).