Find the length of the arc on a circle of radius 4, subtended by a central angle of 2pie/3 radians. provide a sketch pf the center angle and arc
arc length = r * ( theta in radians )
arc length = 4 (2pi/3) = 8pi/3 ≈ 8.38
Here's a sketch : https://www.desmos.com/calculator/aeykjvxrui
The angle (and arc) is bounded by the x axis and the green line moving counter-clockwise
+44 
