Answer:
I believe the answer is A 10 feet
Step-by-step explanation:
the answer is:
42.5
......
i commented the explanation in my answer
I think you want to prove that a rectangle is a quadrilateral. You can prove this with definitions. The definition of a quadrilateral is that it is a shape with four sides. Since a rectangle has four sides, that proves that a rectangle is a quadrilateral.
