# Relative Triangles

#### gizoogleit

Here is the maths question diagram I made: Tri Tri by ~benjaminpott on deviantART

I have absolutely no idea how to find y let alone prove if they are congruent.

Any help would be amazing!

Ben

I know the lines in the diagram do not look paralell, but they are meant to be.

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#### eumyang

When you say that the lines are parallel, do you mean this?

If so, then just use a proportion:
$$\displaystyle \frac{y}{3.7} = \frac{1.7}{6.4}$$
... and solve for y.