Hien would like to estimate the area of nevada using a trapezoid. she uses the dimensions shown as approximations. what is the approximate area of nevada?

The area is approximated by a rectangle (207 x 320) sq. mi.
AND a triangle with a base of 320 mi and height = (483-207)=276 mi.

So total approximate area
=207*320 + (1/2)320(276)
=66240+44160
=110400 sq. mi.

By the way, I have the impression this is not a college level question.  :)