Question

If I'm wrong plz correct me so I can review

Answer 1

check the picture below.

so the area of the rectangle is x*y.

the area of the triangle is (1/2)(w)(z).

if we subtract the area of the triangle, from the containing rectangle, we're in effect making a whole in the rectangle, as you see there in lower-right corner.

`\bf \stackrel{rectangle}{x\cdot y}~~-~~\stackrel{triangle}{\cfrac{1}{2}wz}`