Angles with Parallel or Perpendicular Arms are Equal or Supplementary
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This theorem requires a proof..
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Theorem
Let $A$ and $B$ be angles such that their corresponding arms are either parallel or perpendicular.
Then $A$ and $B$ are either equal or supplementary.
Proof
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Sources
- 1968: M.N. Aref and William Wernick: Problems & Solutions in Euclidean Geometry ... (previous) ... (next): Chapter $1$: Triangles and Polygons: Theorems and Corollaries $1.6$: Corollary
