Definition:Midline of Triangle
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Let $\triangle ABC$ be a triangle.
Let $D$ and $E$ be the midpoints of any two of the sides of $\triangle ABC$.
The line $DE$ is a midline of $\triangle ABC$.
Also known as
Some sources hyphenate: mid-line.
- 1968: M.N. Aref and William Wernick: Problems & Solutions in Euclidean Geometry ... (previous) ... (next): Chapter $1$: Triangles and Polygons: Theorems and Corollaries $1.26$