How to make a program that calculates the user inputs into an equation to print an answer?

I want to write a program that calculates the area of a triangle that can define and give an answer based on user inputs to help fill in the equation but also, define the answer for the area.

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Answered by CodingCactus [earned 5 cycles]
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@ronniegertman here a link to see what I'm dealing because even though, I do that I still find an error -