R≈12.99 c = Circumference=pid= 81.64 To find the radius of a circle you can just divide the diameter by 2. <span>pi = 3.14 </span> <span>d = diameter=c/3.14 Pi is always 3.14 or 22/7. </span> <span>d = 81.64/3.14 </span> <span>d = 26 </span> <span>r= radius= 26/2 </span> <span>radius=13 cm</span>
