Question 1185694
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The area of a trapezoid is the height times the average of the bases:
Area = (DJ)*((AB+CD)/2)<br>
You are given AB and CD.<br>
To find DJ, use the Pythagorean Theorem on triangle AJD.  Note that, since the trapezoid is isosceles, AJ is half of (AB-CD).<br>
You can do the calculations.<br>