11-01-2016
Mathematics

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11-01-2016

A way of working this out is splitting it into a rectangle and a triangle at D, parallel to AB. Label the new point E.
EC = 8 - 3 = 5
ED = 4
4² + 5² = DC
16 + 25 = 41
√41 = 6.40312... or 6.4

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