Answer:
 63,990 mi²
Step-by-step explanation:
We can find the answer by using the formula for the area of a trapezoid and putting in the given numbers.
 A = (1/2)(b1 +b2)h . . . . where b1, b2 are the base lengths; h is the height
 A = (1/2)(198 mi +276 mi)(270 mi)
 A = 63,990 mi²
___
Comment on the area of Missouri
This estimate is about 8.2% low.
