we know that [arcs rc +arc cs arc sm]---------------> they take up half a circle-------->180° they are all congruent so divide 180 by 3 ----------------> 180/3=60°
Find the length of arc rc=60°
if 360°----------------> (2*pi*7) length of circumference 60° -------------------> X X=60*2*pi*7/360------------> 7.327 units
