A radius is a dead straight line from the centre of a circle to a point on its circumference.
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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.
C = 2πrTherefore: (24 x 2) x 3.14 = 150.72 feet
Circumference = 2*pi*24 = 150.796 feet to 3 dp
The circumference of a circle with a 24 foot radius is 2*pi*24 = 150.8 ft (approx) The length of each brick is 12 inches = 1 foot. So 151 bricks are needed.
Volume of a cylinder = Pi x r2 x height cubic feet = 3.14 X (radius X radius) X depth 1 cubic foot = 7.48 gallons OR...... 13,529 gallons of water!