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10 cards from this deck
Specific location written as ordered pair (x,y)(x, y)(x,y)
Always positive, length of straight line connecting them
d=(x1−x2)2+(y1−y2)2d = \sqrt{(x_1 - x_2)^2 + (y_1 - y_2)^2}d=(x1−x2)2+(y1−y2)2
Pythagoras theorem
Doesn't matter: (x1−x2)2=(x2−x1)2(x_1 - x_2)^2 = (x_2 - x_1)^2(x1−x2)2=(x2−x1)2
AC=x2−x1AC = x_2 - x_1AC=x2−x1
BC=y2−y1BC = y_2 - y_1BC=y2−y1
Two possible values (quadratic equation)
The hypotenuse
Always draw a sketch first
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