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Supplementary angle

This is the step-by-step, printable version. If you PRINT this page, any ads will not be printed.

See also the animated version.

After doing this Your work should look like this
Start with a angle BAC.
1.  Extend either leg (here AC) backwards, away from the interior of the angle.
Done.  The angle ∠DAB and the given angle ∠BAC are supplementary.
(I.E. they add to 180°)

Other constructions pages on this site

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Right triangles

Triangle Centers

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Non-Euclidean constructions