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The straight line joining the middle points of two sides of a triangle is parallel to the third side, and equal to half of it.

Elements of Euclid Adapted to Modern Methods in Geometry - Page 68
by Euclid, James Bryce, David Munn (F.R.S.E.) - 1874 - 216 pages
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The Arithmetic Teacher, Volume 17

Arithmetic - 1970 - 742 pages

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Foundations of Technical Mathematics

Warren Donahue, Everett Robertson - Mathematics - 1970 - 504 pages

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Perspectives on Secondary Mathematics Education

Jerry A. McIntosh - Mathematics - 1971 - 284 pages

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Schaum's Outline of Theory and Problems of Advanced Mathematics for ...

Murray R. Spiegel - Juvenile Nonfiction - 1971 - 436 pages

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Algebra and Trigonometry, with Analytic Geometry

Edward Alexander Cameron - Algebra - 1971 - 488 pages

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Geometry; a Guided Inquiry

Don Chakerian, G. D. Chakerian, Calvin D. Crabill, Sherman K. Stein - Mathematics - 1972 - 594 pages

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Calculus and Analytic Geometry

John A. Tierney - Calculus - 1972 - 714 pages

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Encyclopaedic Dictionary of Mathematics for Engineers and Applied Scientists

Ian Naismith Sneddon - Mathematics - 1976 - 816 pages

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Calculus and Analytic Geometry

Sherman K. Stein - Mathematics - 1977 - 1016 pages

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Pure Mathematics, Volume 2

Linda Bostock, Suzanne Chandler, F. S. Chandler - Juvenile Nonfiction - 1979 - 660 pages

...In Questions 1—8 give proofs based on vector methods. 1) Prove that the line joining the midpoints of two sides of a triangle is parallel to the third side and equal to half of it. 2) Prove that the internal bisectors of the angles of a triangle are concurrent. 3) Prove...

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