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15 cards from this deck
Always equal when two lines cross
Angles opposite equal sides are equal
Equal on opposite sides of crossing line
180°180°180°
Equal in same position on each line
Sum of two opposite interior angles
Opposite sides equal length, opposite angles equal
Bisect each other (cut in half)
Equal segments on one = equal on any other
Parallel line divides sides into equal ratios
Proportional (in same ratio)
c2=a2+b2c^2 = a^2 + b^2c2=a2+b2 (c is hypotenuse)
base×height2\frac{base \times height}{2}2base×height
Diagonal divides into two equal areas
Twice the angle at edge (same arc)
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