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Well you've already got two of the sides, then use pythagorean theorem to find the slanted sides (A^2+B^2=C^2) to you find the a and b of the small triangle by getting the height (3) and the base (6-4=2) then plug it into pythagorean. When you find the length of c you times it by two because there are two slanted sides, and add the 6 and the 4

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Q: What is the perimeter of a trapezoid with the length of 6 and 4cm and the height of 3cm?
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