This Demonstration shows how to construct a triangle
given the length
of the side
, the adjacent angle
and the difference of the lengths of the other two sides
1. Draw the segment
2. Draw a point
be the intersection of the ray
and the perpendicular bisector of
is the required triangle.
Since the triangle
is an isosceles triangle with apex
The problem was posed in [1, section IX, problem 1, solution p. 291].
 M. Bland, Geometrical Problems Deducible from the First Six Books of Euclid, Arranged and Solved
, Cambridge: J. Smith, 1819.