The circumference of a circle with a diameter of 28 cm will be pi*28 cm which is approx 88.0 cm
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If the circumference of a circle is 28 inches the diameter is: 8.913 inches (circumference divided by Pi = diameter).
Circumference of a circle: 2*pi*radius or diameter*pi Area of a circle: pi*radius squared
Perimeter (or circumference) of a circle = pi x diameter = pi x 28, but we need the circumference of only half of it (semicircle is half of a circle) Hence the answer is pi x 14 = 3.1415 x 14 = 43.981 mm
Well, honey, the circumference of a circle is calculated using the formula C = 2πr, where r is the radius. Since you didn't give me the radius, I can't give you the exact circumference. But if the diameter is 56 cm, then the radius would be half of that, which is 28 cm. Plug that into the formula and you'll get your answer.
28"