Solving Point Source Light Problem | HELP

[BuBbLeS01]

Point Source...HELP!

Homework Statement

A point source of light illuminates an aperture 2.3 m away. A 10.2-cm-wide bright patch of light appears on a screen 1.02 m behind the aperture. How wide is the aperture?

Homework Equations

The Attempt at a Solution

This looks like a geometry problem but I am not seeing it??

 

[CompuChip]

I have included a drawing of the situation in the attachment.
You can use the blue triangle to find the angle $\alpha$.
Then use standard trigonometry to find the answer (which is the length of one of the sides of the red triangle).

 

[BuBbLeS01]

wow thank you very much!