we know that [arcs rc +arc cs arc sm]---------------> they take up half a circle-------->180° <span> they are all congruent so divide 180 by 3 ----------------> 180/3=60</span>°
Find the length of arc rc=60°<span>
if 360</span>°----------------> (2*pi*7) length of circumference 60° -------------------> X <span>X=60*2*pi*7/360------------> 7.327 units
the answer is </span>the length of arc rc= <span>7.33 units