# 12. Construct a Triangle Given the Length of Its Base, the Perimeter and the Difference of the Base Angles

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This Demonstration shows a construction of a triangle given the length of its base , the sum of the lengths of the other two sides and , and the difference of the base angles.

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Construction

Let , and .

Draw a line segment of length .

Step 1: Draw a circle with center with central angle above the chord .

Step 2: Measure out the point on the circle at distance from the point on the other side of from . Let the point be the intersection of and the right bisector of .

Verification

Since the central angle equals by construction, . On the other hand, , so .

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Contributed by: Izidor Hafner (August 2017)
Open content licensed under CC BY-NC-SA

## Permanent Citation

Izidor Hafner

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