Find the area of the triangle (in square units) by decomposition.
7 height
base 7
Since the base and height of the triangle are both 7 units, we can decompose the triangle into two right-angled triangles with base and height both equal to 7 units.
Therefore, the area of the triangle is (1/2) x base x height = (1/2) x 7 x 7 = 24.5 square units.