Circumference = pi * diameter
C = pi(3.14159 should do) * 30 inches
= 94.2478 inches circumference
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We're assuming the table and cloth are round? The cloth is a circle with a diameter of 90 inches - 30 from the floor to the table, 30 more across the table, and 30 more to get back down to the floor. The circumference of a circle is pi times the diameter. Do the math!
You've stated an impossible question. If a circle has a circumference of 94.2 cm, it has a diameter of 30 cm. If it has a diameter of 15cm, it has a circumference of 47.1 cm.circumference = 2 * pi * radius = pi * diameterIf you had stated the question correctly (changed circumference to 47.1 cm OR changed diameter to 30 cm OR changed "diameter" to "radius"), then the answer would be:pi = circumference / diameter = (e.g.) 94.2 cm / 30 cm
The circumference of a 30 ft circle is: 94.2 feet.
The radius of the circle is half the diameter of the circle. 30mm radius would mean 60mm diameter or 6cm.
d=9.5541401 in.