Circles and Circumference

Match the parts of the circle to their matching positions Diameter ? Radius ? Chord ? Center ? The diameter of a circle, d, is equal to two times the radius. d=2r A B If AB = 5, what is the diameter of the circle? AB = rAB = 5r=5d= 2(r)d = 2(5)d = The diameter of a circle, d, is equal to two times the radius. d=2r A B If AB = 8, what is the diameter of the circle? d = Circumference is the distance around a circle. Like the perimeter, but for circles.The formula for circumference is 2 times pi(3.14) timesthe radius of the circle. C = 2πr A B AB = 4 inC = 2πr inC = 2π(4) inC = 2 (4) (3.14) inC = 25.12 in A B Find C when AB = 25 C = Pi already here Find the Radius, Diameter, and Circumference of each problem below. 1. C = 15π 2. d = 6 3. r = 7 d = r = C = r= C = d= Find each measureif diameter AB = 16 CB = CE = DF = Circumference of circle C = Circumference of circle D = A C D F E B |

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