A r L 2 A r L 2 Here is a three-tier birthday cake 6 6 inches tall with a diameter of 10 10 inches. And we get that our arc length is equal to-- well 10360 is the same thing as 136. Whenever you want to find the length of an arc of a circle a portion of the circumference you will use the arc length formula.
The arc length is frac 1 4 of the full circumference.
Finding arc length Using the arc length formula find the measure of the arc length of each sector of your circle. The arc length is frac 1 4 of the full circumference. If the measure of the arc or central angle is given in radians then the formula for the arc length of a circle is Arc Length r m where r is the radius of the circle and m is the measure of the arc or central angle in radians This video shows how to use the Arc Length Formula when the measure of the arc is given in radians. Arc length 1 ____ Arc length 2 ____ Arc length 3 ____ Arc length 4 ____ 1 2 3 4.