The area of the small square is what percent of the area of the large square if the large square is 5 inches and the small squar
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The drawing seems to suggest that angles BFA, AFE and EFD span a straight angle, just like angles BFC and CFD
This means that you have
But we know that both BFA and EFD measure 70 degrees, so the equation becomes
So, if you subtract 140 from both sides, you have