B Helping a 5-Year-Old Integrate a Function in Kindergarten

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what is the rule for integration along two lines that meet at an angle?
A newbie who knows basic math is helping a five year old do his kindergarten project. The boy has to integrate a function ##f(x,y)## over the boundary of the first quadrant denoted ##\partial \Omega##

where ##\partial\Omega = \{ x=0, y\geq 0 \} ∪ \{ x\geq 0, y=0 \} ##

How would I explain to this five year old how to integrate this?

$$\int_{\partial\Omega} f(x,y) dS $$
is this right?

$$\int^\infty_0 f(x,0) dx + \int^\infty_0 f(0,y) dy$$
 
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It looks right to me. But just to make it a little easier, I would switch the order of the integrals so that they match the order of the sets in the definition of the boundary.
 
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