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The approximate area of a circle with a 12-inch diameter is: 113 square inches.
If the diameter of a circle is 12 inches the circumference is: 37.7 inches (diameter x Pi = circumference).
The circumference of a circle is given by Circumference = pi x diameter. The area of a circle is given by Area = pi/4 x diameter2. Thus for a circle with circumference c = 12 in. The area will equal a = 11.459 in2.
The area of a circle with a diameter of 6.5 is: 33.18 square units.
Area of a circle = (1/2 x diameter)2 x piArea of a 24 inch diameter circle:(12 inches)2 x 3.1416 = 144 square inches x 3.1416 = 452.4 square inches