Circumference and Area

The circumference of a circle is: Distance from the outside to the center. Distance from one side through the middle to the other side. Distance around the circle. The space inside a circle. What is the formula for circumference? C = 2πd C = 2r C = πr2 C = 2πr The area of a circle is: Distance from the outside to the center. Distance from one side through the middle to the other side. Distance around the circle. The space inside a circle. What is the formula for area? A = 2πd A = 2r A = πr2 A = 2πr Link the correct radius to their diameter. d = 15 r = 7.5 d = 8 r = 4 r = 20 d = 40 d = 3.5 r = 1.75 r = 0.5 d = 1 Label the parts of the circle. You options are: radiusdiametercircumferencearea Diameter Radius Circumference area Pick two circles to find the circumference and area. Shape Exact Circumference Exact Area Approximate Circumference Approximate Area 18π in 81π in2 56.52 in 254.34 in2 10π in 25π in2 31.4 in 78.75 in2 36π mi 324π mi2 113.04 mi 1017.36 mi2 22π mi 121π mi2 69.08 mi 379.94 mi2