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Delta, is just a Greek letter very used in Math. It's meaning depends on the context.
But a very common meaning, specially for capital delta ( a triangle) is difference. For instance, a temperature Delta usually means the difference of the temperatures of 2 objects. In your case, it probably means the difference of the given values
Typically, delta means "change in" in math.
Graphic designers use math because they have to measure out models to a certain scale. They need to know how to calculate exact measurements.
Now a days, learning has become much easy. You can get help with concepts of math online. You can search for math help or geometry help online and get a learning from online. Try typing in "cool math 4 kids" in your search engine. That's a great website for stuff like that, but I can't think of their address right now.
The exact value of 60 degrees would be 1/2. This is a math problem.
Tangent, in geometry, is used to describe when figures have only one point in common. In Trig. tangent is applied to triangles.