b1+b2/2
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To find the median of a trapezoid, you would add the lengths of the two bases of the trapezoid and then divide by 2. This will give you the median, which is the segment connecting the midpoints of the two non-parallel sides of the trapezoid.
The formula for the area of a trapezoid is A = (a + b) * h / 2, where a and b are the lengths of the two parallel sides, and h is the height of the trapezoid.
The formula for the area of a trapezoid is A = (1/2) * (a + b) * h, where 'a' and 'b' are the lengths of the parallel sides and 'h' is the height of the trapezoid.
To measure the area of a trapezoid, you can use the formula: Area = (1/2) * (sum of the lengths of the parallel sides) * (height). Simply add the lengths of the two parallel sides together, multiply by the height, and then divide by 2 to find the area of the trapezoid.
To calculate the area of a trapezoid, you can use the formula: Area = 0.5 * (sum of bases) * height. Simply add the lengths of the two parallel sides (bases) of the trapezoid, multiply the sum by the height, and then divide by 2 to find the area.
Since EF is a median, it will bisect side AD. Therefore, x = DC. In trapezoid ABCD, the bases are side AD and side BC. However, from the information given, we cannot determine the value of x without additional details.