Assertion: parallelogram's line | /r/CapableOf | pass through third edge
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Source sentences:
text: In the triangle BCD, the line (IJ) passes through the midpoints of two of his edges [DC] and [BC], thus the line (IJ) will be parallel to the line that passes by the third remaining edge which is (DB), so (DB)//(IJ) and the distance IJ=1/2 DB , this is a property that they have studied, they just named property with no other name, but they can use it in triangles: '' If ABC is a triangle, M and N are the midpoints of two of his edges, then the line (MN) is parallel to the line that passes through the third edge, and the distance MN is half the measure of the third edge.''After that i tried proving that EDBJ is a parallelogram ( using only basic parallelogram properties ), but i couldn't find a way.2)