Area = 706.5
Area of a circle = pi x r2
Diameter = 30, then radius = 15
pi x r2
3.14 x 152
3.14 x 225 = 706.5
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The area of a circle when the diameter is 30 inches is: 706.9 square inches.
d = 30
Well, honey, the diameter of a circle is the distance across the center, so for a 30-inch circle, the diameter would be 30 inches. I mean, it's right there in the question, darling. So, yeah, the diameter of a 30-inch circle is 30 inches.
The area of a circle is pi × r2. pi = 3.141592653589793 5 feet = 60 inches. The radius is half the diameter so the radius is 30 inches. If you plug 30 inches into the formula you get the answer of 2827.4333882308138 inches for the area of the circle.
If the circumference of a circle is 30 cm its diameter is: 9.549 cm