Hint:
Compute the area of triangles.
This is the question:
Express the area of the rectangle shown in the accompanying figure as a function of the x-coordinate of the point P.
My attempt:
I know the area of a rectangle is A = xy
Since it needs to be a function of the x-coordinate, I need to find y in terms of x, so I can substitute it and have only 'x' as a variable. But I'm not sure how to calculate y.
Any assistance would be great.