Answer:
110,400 square mi
Step-by-step explanation:
The diagram is attached to the answer
Area of a trapezoid=(1/2)(h)(b1+b2)
1/2*320(483+207)
=1/2*320*690
=1/2*220,800
=110,400 square mi
Or alternatively
Find the Area of a rectangle + Area of a triangle
Area of a rectangle=Length*width
=207*320
=66,240
Height of the triangle=total height - height of the rectangle
=483-207
=276
Area of a triangle=1/2*base*heght
=1/2*320*(483-207)
=1/2*320*276
=1/2*88,320
=44,160
Area of the trapezoid=Area of a rectangle + Area of a triangle
=66,240+44160
=110,400 square mi
