Click In Triangle?

I used to know this years ago... How do I detect a click within a triangular region?

I want to detect when a click occurs in the red region above, and ignore clicks that occur in the gray. In the past I used a formula, but can't recall what it was.

(I don't believe Construct ignores clicks in the transparent pixels of an image, does it?)

Thanks for suggestions here.

Generally you would alter the collision polygon, to match the shape.

blackhornet

Thanks, exactly what I needed.