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Hello, i solvee it but the book doesn't give an answer. 

In triangle ABC (see Figure 1.4),  BCA = 90◦, and D is the foot of
the perpendicular line segment from C to segment AB. Given that |AB| = x and
 A = θ, express all the lengths of the segments in Figure 1.4 in terms of x and θ.

The way i started it:

I found that theta=45 degrees as well as all angles are =45 Both triangles are isosceles 45-45-90 triangle. X=sqrt(2) 

P.S exercise of Algebra & Trigonometry as well as some geometry. But this problem i didnt use trig so i think my solution is false.

 Aug 15, 2019
 #1
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 Sep 20, 2019

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