TO DRAW ANY TRIANGLE, GIVEN IN POSITION AND MAGNITUDE, IN A HORIZONTAL
PLANE.
[Illustration: Fig. 18.]
Let _ABC_ (Fig. 18.) be the triangle.
As it is given in position and magnitude, one of its sides, at least,
must be given in position and magnitude, and the directions of the two
other sides.
Let _AB_ be the side given in position and magnitude.
Then _AB_ is a horizontal line, in a given position, and of a given
length.