Sum of two angles

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 two angles, ∠BAC and ∠RPQ.

The goal is to add ∠BAC to ∠RPQ

1.  Set the compasses on A, and adjust to any convenient width
2.  Make an arc across both legs of the angle, creating points J and K.
3.  Set the compasses on P and make an arc to the left of, and across, RQ.
4.  Set the compasses on K and adjust the width to point J.
5.  Set the compasses on L and make an arc across the previous one, creating point M.
6.  Draw a line from P, through M and on to new point S
Done. The angle BAC has been added to angle RPQ

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Circles, Arcs and Ellipses


Non-Euclidean constructions