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In trapezoid ABCD, the parallel sides AB and CD have lengths of 8 and 20 units, respectively, and the altitude is 12 units. Points E and F are the midpoints of sides AD and BC, …
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In trapezoid ABCD, the parallel sides AB and CD have lengths of 8 and 20 units, respectively, and the altitude is 12 units. Points E and F are the midpoints of sides AD and BC, …
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Jun 15, 2019
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In trapezoid ABCD, the parallel sides AB and CD have lengths of 8 and 20 units, respectively, and the altitude is 12 units. Points E and F are the midpoints of sides AD and BC, respectively. What is the area of quadrilateral EFCD in square units?
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Birarduh
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The length of side EF is the average of the lengths of the bases AB and CD of trapezoid ABCD.
EF = (8 + 20)/2 = 14
Trapezoid EF has bases 14 and 20.
The height of trapezoid EFCD is half the height of trapezoid ABCD, or 6.
A = (B + b)h/2 = (20 + 14) * 6 / 2 = 102
Answer: The area of trapezoid EFCD is 102 square units
DrKey
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Jun 21, 2019
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