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fundamental counting principle
if an event can happen in N ways, and another, independent event can happen in M ways, then both events together can happen in N x M ways.
opposite angles are equal (each pair of angles along the same line add to 180 degrees)
Ax + By=C, where A, B, and C are not decimals or fractions, where A and B are not both zero, and where A is not a negative
The part of a circle that looks like a piece of pie. A sector is bounded by 2 radii and an arc of the circle.
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