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I don't know how to start or the answer. Any help would be nice.

 Oct 21, 2020
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Using Pythagorean theorem:

 

1/  find BC     (AD = BC)

 

2/  find CF

~~~~~~~~~~~~~~~~~~~~~~~

3/  find all 3 angles of an isosceles triangle CFD    (∠CFD ≅ ∠FCD)

 

side AB = CD = (CF/2) / cos(FCD)

 Oct 21, 2020

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