Not really my solution... just a slightly cheating version of @bmtran's.
Similar Triangles - find the height of the tree
Compress strings (not springs)
Angle between Two Vectors
Make a logical diamond using GALLERY function
Sum the elements in either diagonal of a square matrix
Better bullseye matrix
Back to basics 11 - Max Integer
Back to basics 24 - Symbolic variables
Back to basics 6 - Column Vector
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