The functional relation between the diameter d and the area a is a = (pi)(d/2)2. Therefore, (pi)d2 = 22(25) = 100; d = sq rt (100/pi) = 5.6 units, to the justified number of significant digits.
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The circumference of a circle with a diameter of 25 is: 78.54
Area = (pi) R2 = (pi) (1/2 diameter)2 = 25 pi = 78.54square feet (rounded)
The area of the sector of a circle which has a diameter of 10 inches if the length of the arc is 10 inches is: 25 square inches.
The area of a circle with a diameter of two cm is about 3.1416 cm.
The area of a circle if the diameter was s 7ft is 38.48ft