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6*5/2 = 15.
Use the formula n(n-1)/2 --> 7(7-1)/2 = 7(6)/2 = 42/2 = 21.
Hexagon
Points: (0, -2) and (6, 0) Slope: 1/3 Equation of line: 3y = x-6
Points: (-6, -7) and (6, 5) Slope: (-7-5)/(-6-6) = 1