September 23rd, 2016, 03:21 PM  #1 
Newbie Joined: Aug 2016 From: SantosSP / BRASIL Posts: 15 Thanks: 0  Impossible
Consider the trapezium ABCD, as the following figure, in which the angles of the vertices A and B are straight. Knowing that the measure of AB is 4 cm and the other side measures in cm, are given on the basis of fixed constant (see figure). Determine the measure of segment BD. Tip: Build a helper line parallel to AB and use the Pythagorean theorem. 
September 23rd, 2016, 03:54 PM  #2 
Senior Member Joined: Aug 2016 From: morocco Posts: 273 Thanks: 32 
let H be the point of BC such that DH//AB the pythagore theorem in the triangle DHC gives $9a^2+16=25a^2$ which gives $a=1 cm$ then in the trangle ABD gives $BD=5 cm$ 

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