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The determinant of a 2 x 2 matrix.
Author:
Mark Willis
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Triangle Angle Theorems
Congruent Complements Theorem
Polygons: Exterior Angles (27 September 2020)
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Sum of the Angles in a Triangle
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Teorema de Thales
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Κατασκευή τετραγώνου ισοδύναμου με ορθογώνιο(geom-10)
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Centroid or Barycenter
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