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10 cards from this deck
Point exactly halfway between two endpoints
Average the xxx-coordinates and average the yyy-coordinates
(x1+x22,y1+y22)\left(\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2}\right)(2x1+x2,2y1+y2)
The xxx-coordinate remains constant
The yyy-coordinate remains constant
(x2−x1)2+(y2−y1)2\sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}(x2−x1)2+(y2−y1)2
Pythagoras' theorem
A point (ordered pair)
A number (length)
x2−x1x_2 - x_1x2−x1
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