
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
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December 7th, 2016, 08:05 AM  #1 
Newbie Joined: Aug 2016 From: SantosSP / BRASIL Posts: 15 Thanks: 0  I need help!
In the following figure, ABC is a triangle with sides measuring 25 cm, AB = AC = 15 cm and BC = 20 cm. And is quad BDEF a square. In those circumstances, the measure in centimeters, square BDEF side is equal to? 
December 7th, 2016, 08:31 AM  #2 
Senior Member Joined: Sep 2015 From: CA Posts: 749 Thanks: 398 
this can't possibly be correct the way you've labeled things. AC is the hypotenuse of a right triangle and thus AC > BC, AC > AB 
December 7th, 2016, 09:09 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 16,368 Thanks: 1172 
The intention is presumably that AC = 25 cm, AB = 15 cm and BC = 20 cm. If BD = DE = x, DC = (20 cm  x) and x/(20 cm  x) = 15/20, so x = (60/7) cm. 