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Use Pythagoras to find the lengths of the sides:

42+12 = 17 and the square root of this is the length of the sides which works out at about 4.123105626

Perimeter: 2*4.123105626+10+12 = 30.24621125 inches

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Q: What is the perimeter of ann isosceles trapezoid with a height of 4 inches and bases of 10 and 12?
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