Step 1: Find the area of .
If two triangles share the same vertex and have bases of equal
length that lie along the same line, then the heights of the
triangles must be the same and the areas of the two triangles must
and share a vertex at , with
bases and of equal length.
Step 2: Find the area of .
If two triangles share the same base and their vertices lie on a
straight line parallel to the base, then the triangles are equal
Therefore, the area of equals that of
. These two triangles overlap at ,
so we can remove that part from both figures and the areas will
still be the equal. Therefore,
Step 3: Find the area of figure .