Diameter of circle: 70/pi = 22.28 mm rounded to two decimal places
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219.91mm
45mm * 45mm * 3.14 = 6358.5 sq. mm
3,848.45mm2.
If you mean the diameter of a circle with area pi, then the diameter is 2. If you mean the diameter of a circle with circumference pi, then the diameter is 2. If you mean the diameter of a circle with diameter pi, then the diameter is pi. If you mean the diameter of a circle with radius pi, then the diameter is 2pi.
Diameter of a circle = circumference/pi Diameter of a circle = 2*radius