Answer:
Step-by-step explanation:
The green part, I take is what is already covered, not what has to be covered.
The triangle is what you need to find which is given as 9 square feet. So the first statement can't be right.
Here you have to subtract 9 from 72
Area needed = 72 - 9 = 63 square feet.
72 square feet would be the amount with the triangle filled in.
63 square feet is the number of square feet needed with the triangle cut out.
