1: if u use the same measures they will be congruent angles. 2: because the segment is being cut in half. 3: their has to be an intersection in the arcs<span />
T = k/R where k is the constant of variation, T=time and R=speed. Plug in the given values:- 12 = k/60 k = 12*60 = 720 So the equation of variation is T = 720/R