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To construct a triangle, given its perim...

To construct a triangle, given its perimeter and its two base angles.

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Draw a line segment `XY` equal to `AB+AC+BC`.

Make angle equal to `/_B` from point `X`. Let the angle be `/_LXY`.
Make an angle equal to `/_C` from point `Y`. Let the angle be `/_MYX`

Bisect `/_LMX` and `/_MYX`. Let the bisector intersect at a point `A`.

Make a perpendicular bisector of `AX`. Let it intersect `XY` at a point `B`.
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