Answer:
see the attached figure to better understand the problem
we know that
the area of the triangle ABC is equal to the area of the triangle 1
The area of the triangle 1,2,3 and 4 is the area of a rectangle
The area of the rectangle is equal to
Find the area of the triangle 2
Find the area of the triangle 3
Find the area of the triangle 4
Find the area of the triangle ABC
therefore
the answer is
the area of the triangle ABC is equal to
Explanation: