12 x 12 sounds like a square, not like a circle. To specify a circle, you need a single number, for example the radius or the diameter. Assuming the diameter is 12, the radius would be half of that (6 units). The "size" of the circle can be considered this radius (6), the diameter (12), or the area calculated by the formula pi * radius * radius.
Area of a circle is pi x r2 Area of a circle having a a radius of 12 units = 3.1416 x 144 units2 = 452.389 units2
Circumference = 2 x pi x radius = 24 pi 2 x radius = 24 ; radius = 12 units
The circumference of a circle with a diameter of 12 is about: 37.7 (C = diameter x Pi).
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The circumference of a circle with a radius of 12 meters is: 75.4 meters (r x 2 x Pi = circumference).
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The circumstance of a circle is 2 x pi x radius. I.e.: if the circle has a radius of 6, the circumstances 12×π which is 37.6991118432
If the diameter of a circle is 12 inches the circumference is: 37.7 inches (diameter x pi = circumference).
2 feetdiameter = 2 x radiusdiameter = 2 x 12 inches = 2 x 1 foot = 2 feet
Circumference = pi x the diameter of the circle C = pi (12 inches) So C = 3.14159 X 12 C =37.69906 (approx)
Area of a circle = Pi times r^2. r=12 A = pi x (12^2)= pi x 144 equals approximately 452.3893421