Question

Can someone plz show me how to do this. Thx

Answer 1

are you familiar with how to find the area of a rectangle?
A= base*height -- for rectangles

how about the area for a trapezoid?
well what happens when we cut the triangular section from one side and then fit it onto the other side, do we get a rectangle?

so finding the area of a trapezoid is essentially the same as finding the area of a rectangle.
In your case, t is the height,18 mi is your base and the area given is 216mi^2

"plug" those all into the rectangular area equation, divide the base from both sides, and you should be able to determine height

Answer 2

So to find area you have to use this rule : area= base•height and if you have area and one side you will have to divide to find another side: 216 : 18 =12


12 mi is missing length