Doing a coding assignment for c++, the program asks for the area

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Doing a coding assignment for c++, the program asks for the area of a triangle:

(height * base) / 2;

Now it's asking for the circumference of a triangle. For the life of me I cannot find a solid source on the internet explaining to me where to find the circumference of a triangle, the code assignment instructions don't even tell me what type of triangle it is.

It's not really a coding request for help either, I just can't find a way to implement this code using this unknown formula.