4.What is the circumference of a 6 mm circle?
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the circumference of a circle, multiply the diameter of the circle with π (pi). The circumference can also be calculated by multiplying 2×radius with pi (π=3.14).
Circumference of Circle: 2πr
Perimeter of semi-circle: πr
Area of semi-circle: πr2/2
Area of circle: πr2
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