The Complete Circular Arc Calculator 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. Geometry calculator solving for circle segment chord length given radius and circle center to chord midpoint distance Circle Segment Equations Formulas Geometry Calculator - Chord Length AJ Design Definitions and formulas for the arc and the arc length of a circle, sector and the area of the sector of a circle, the unit circle, the angles on the unit circle in radians, the angles on the unit circle in degrees, the points on the circumference of the unit circle Just scroll down or click on what you want and I'll scroll down for you! Feb 01, 2016 · Learn how to find the arc length in a circle using radian angle measures in this free math video tutorial by Mario's Math Tutoring. 0:26 Formula for Finding Arc Length Using Radius and Central ... May 13, 2015 · First we divide the angle by 360. If the arc was a full circle, it would have 360 degrees, but because it is not a complete circle we need to know what percent of a circle it is. We do this by diving the angle by the total angle. 120 degrees ÷ 360 degrees = 0.3333 or 33.33% of a full circle. Next we calculate the circumference of the full circle. The angle formed by the intersection of 2 tangents, 2 secants or 1 tangent and 1 secant outside the circle equals half the difference of the intercepted arcs!Therefore to find this angle (angle K in the examples below), all that you have to do is take the far intercepted arc and near the smaller intercepted arc and then divide that number by two!