If the diameter of the circle is 24 feet, the radius is half that, or 12 feet. If the circumference of the circle is 24 feet, the radius is 24 divided by 2 divided by pi, or 3.82 feet.
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A radius is a dead straight line from the centre of a circle to a point on its circumference.
Circumference = 2*pi*24 = 150.796 feet to 3 dp
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The formula for the area (A) of a circle is A = π r2 - where r is the radius. The diameter (d) of a circle is twice the radius. The area of circle having a diameter of 24 ft is A = π 122 = 144π = 452.39 sq ft (2dp)
Area of a circle = pi*radius squared