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## Homework Statement

Find the area of a triangle, assume that you don't know the formula of area of any other figure.

## Homework Equations

## The Attempt at a Solution

Well, i was trying to figure out how to find the area of a triangle out of nowhere, but could not get it. I want to know how it was formulated for the very first time. Please help me out (remember that you cannot use any other area formula) . You can use basic calculus, but not very advanced one.