32.6 I think. I took the height, multiplied it by 2 (because there are to sides that is that length) and then subtracted it by 71.8 to get 65.2, lastly I divided it by 2 for the same reason (there are two sides the same length).
The length of the base is 32.6
3.3 + 3.3 = 6.6
Subtract 6.6 from 71.8 : 65.2
Divide that by 2 : 32.6
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