Glencoe Math: Course 3, Volume 2
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Exercise 3 Page 586

The area of a trapezoid is one half the product of its height and the sum of its bases.

71.5m^2

Practice makes perfect
The area of a trapezoid is one half the product of its height and the sum of its bases. In the given diagram, we can see that the lengths of the bases are 8 and 5 meters.
Having the height and the lengths of the bases, we can substitute them into the formula for the area of a trapezoid.
A=1/2h(b_1+b_2)
A=1/2( 11)( 8+ 5)
A=1/2(11)(13)
A=71.5
The area of the trapezoid is 71.5m^2.