Align the circle so that the origin of the coordinate plane is the center of the circle, find the radius, and use the area formula for circles (PI•r^2)
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Diameter = 7.8115 cm
It is: 16*pi square cm
Area of a circle = pi multiplied by (radius squared)Pi is approximately 3.141 so do r x r x 3.141
A 7-by-9 grid has an area of 63 square units.
3848.451000 mm2 > 38.48451 cm 2