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  3. What is the area of the trapezoid shown above?

What is the area of the trapezoid shown above?

admin2013-05-19  25
问题 What is the area of the trapezoid shown above?
选项 A、50
B、86
C、136
D、288
E、2,304
答案C
解析 The correct answer is C. The quickest way to solve this problem is to note that, if you draw a line from C perpendicular to AD, you create a rectangle whose area is 16x8, or 128 square units. Because the trapezoid is slightly larger than the rectangle, the area must be slightly greater than 128. Only answer choice C works. You can also calculate the area of the small tri-angle you created when you drew the perpendicular line:(2x8)= 8; 128 + 8 = 136.
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