Recall that is the circumference of the whole circle so the formula simply reduces this by the ratio of the arc angle to a full angle 360. To find arc length multiply the total circumference of a circle by the the fraction of the total circle that defines the arc with the length for which you are solving. Therefore the arc length formula is given by.
Therefore the arc length formula is given by.
Instead of having two formulas for the arc length of a function we are going to reduce it in part to a single formula. As circumference C 2pr L th 2pr 2p L th r. By transposing the above formula you solve for the radius central angle or arc length if you know any two of them. The formula to calculate the arc length is.