The Ungerecht Family Tree

Complementary angles add up to 90' (like <b and <c in the shown right triangle, or <e and <f)

Supplementary angles add up to 180' (like <b and <d as shown)

Distance between two points = √(Δx² + Δy²) (based on Pythagorean theorem)

alternative interior angles are equal

vertical angles theorem - angles opposite one another when two straight lines intersect are congruent

Length of a vector can be written as ||v|| (the "norm" of vector v)

Distance of two vectors: first add the vectors to make a combined vector Adding vectors: add each part of the vector, ie. (x1 + x2, y1 + y2)

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