In this lesson:[br]We use the pattern d, r, C, A[br]             d =26  C = 26π[br][br]            r =13  A = 169π[br][br]Notice in the pattern how we get from:[br] diameter to radius - diameter divided by 2 = radius[br] diameter to Circumference - diameter times π = Circumference [br] radius to diameter - radius times 2 = diameter[br] radius to Area - radius squared r² times π = Area

Find d, r, C, A Leave your answer in terms of π. Use the slider to pick a different diameter for each problem.[br]1) d = C =[br] r = A =[br][br]2) d = C =[br] r = A =[br][br]3) d = C =[br] r = A =[br][br]4) d = C =[br] r = A =

Find d, r, C, A Leave your answer in terms of π. Use the slider to pick a different radius for each problem.[br]5) d = C =[br] r = A =[br][br]6) d = C =[br] r = A =[br][br]7) d = C =[br] r = A =[br][br]8) d = C =[br] r = A =

Find d, r, C, A Then use π = 3.14. Use the slider to pick a different diameter for each problem.[br]9) d = C = C = [br] r = A = A = [br][br]10) d = C = C =[br] r = A =    A =

Find d, r, C, A Then use π = 3.14. Use the slider to pick a different radius for each problem.[br]11) d = C = C = [br] r = A = A = [br][br]12) d = C = C =[br] r = A =    A =

13) If you are given the diameter, how do you get the radius?[br]14) If you are given the diameter, how do you get the Circumference? What is the Formula? C = [br]15) If you are given the radius, how do you get the diameter?[br]16) If you are given the radius, how do you get the Area? What is the Formula? A = [br]NOTE: We can use the Formulas, but it's so much easier just to do d, r, C, A for every Circle problem.