How can I determine $\int xy \;ds$ of a triangle with points $(0,0)$, $(1,0)$ and $(1,1)$ *The integral has the letter $C$, which I am not sure how to input here.
I know it may seem easy, but I am not sure of the working
I know that $ds = \sqrt{dx^2 + dy^2}$ but I do not even know what is $dx$ or $dy$ in this case.
Should I split into three segments? What is the simplest method to solve this?