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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 I prefer if you leave π in your answer AB = 4 inC = 2πr inC = 2π(4) inC = 2 (4) π inC = 8π in A B Find C when AB = 25 C = π Pi already here Triangle CBE is 45-45-90 CD = 2√2 What is the Circumference of circle A? C A D B (Find CB first to find the diameter, d. Then, half the diameter to get the radius,1/2d = r. ) C = π Find the Radius, Diameter, and Circumference of each problem below. 1. C = 15π 2. d = 6 3. r = 7 d = r = C = π r= C = π d= Find each measureif diameter AB = 16 CB = CE = DF = Circumference of circle C = π Circumference of circle D = π A C D F E B |