Find the area of the trapezoid by composition of rectangle and triangles.
A)48 units^2
B)72 units^2
C)84 units^2
D)88 units^2
B) 72 units^2
To find the area of the trapezoid by composing it of a rectangle and two triangles, we can first find the area of the rectangle and then subtract the areas of the two triangles.
The trapezoid can be divided into a rectangle and two triangles as shown below:
```
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/ \
/ \
/ \
/ \
/_______________\
```
The rectangle has a length of 8 units and a width of 6 units, so its area is 8 * 6 = 48 units^2.
Each of the two triangles has a base of 5 units and a height of 3 units, so their combined area is 2 * (1/2 * 5 * 3) = 15 units^2.
Therefore, the total area of the trapezoid is 48 - 15 = 72 units^2. So, the correct answer is B) 72 units^2.