Answer:
56 in2
Step-by-step explanation:
14x8x1/2 (1/2 because a trapezoid formula divides by 2)
112x1/2
=56
6. the answer is 6. because 3x what she has is equal to 18 all u do is divide. u get six.
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.
