Example
Problem Find the diameter of the circle.
d = 2r d = 2(7) d = 14 The diameter is two times the radius, or 2r. The radius of this circle is 7 inches, so the diameter is 2(7) = 14 inches.
Answer: The diameter is 14 inches.
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For example, if the diameter is given as 24 units, then the radius is 24/2 = 12 units. If the circumference of a circle is given as 44 units, then its radius can be calculated as 44/2π.
