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Mathematics 7 Online
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Theorem: The segment joining the midpoints of two sides of a triangle is parallel to the third side and half its length. A two column proof of the theorem is shown, but a justification is missing. http://prntscr.com/8wd652 Which is the missing justification? Additive Identity Midsegment Theorem Slope Formula Transitive Property of Equality

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@Michele_Laino

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