Triangle JKL is similar to TPD. Find the length of side b.
To find side b, you have to find the ratio between both triangles.
TD/JK=9/5 or 1.8
A common error here is that you multiply side DP by the ratio.
What you actually have to do here is divide side DP by the ratio
DP=6, so 6/1.8
6/1.8= 3.¯3
9 / 6 = 5 / b
+505 
