The lengths of the bases of an isosceles trapezoid are 40 and 22, and the length of the altitude is 7. Find the length of a leg of the trapezoid.
40 – 22 = 18
1/2 of 18 = 9
c2 = a2 + b2
leg2 = 92 + 72
leg2 = 81 + 49 = 140
leg = sqrt(140)
leg = 11.83
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