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10 cards from this deck
Point exactly halfway between two endpoints
M=(x1+x22;y1+y22)M = \left(\frac{x_1+x_2}{2}; \frac{y_1+y_2}{2}\right)M=(2x1+x2;2y1+y2)
Takes arithmetic mean (average) of corresponding coordinates
x=x1+x22x = \frac{x_1 + x_2}{2}x=2x1+x2
y=y1+y22y = \frac{y_1 + y_2}{2}y=2y1+y2
Draw a sketch
On the line, at equal distances from both endpoints
Diagonals bisect each other (share same mid-point)
Substitute known mid-point into formula, solve for unknown
Use brackets when substituting to avoid sign errors
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