icecreamlover

I've drawn a diagram here https://www.simpleimageresizer.com/_uploads/photos/7aca4b83/20230623_125748_29.jpg
 

I don't understand how I am supposed to find the altitude of the triangle...this isn't a right triangle and there are no similar triangles visible in the diagram...so I can't use the Pythagorean theorem,...so on my first try, I've tried finding all the angles inside the triangles here...and I've tried using basic trigonometry to help me find one of the side lengths...but that didn't really help me with finding the altitude...

I really need help and fast!