Does it matter the order you put in the coordinates for the distance formula

Hello,

For the distance formula of 


the order of the coordinates does not matter. This is because  and  are being squared, so whether the difference is negative or positive, in the end the value will be the same as it is being squared (squared values are always positive (ignoring 0)).

Hope this helps!

Maybe the answer is 20mm. all i really did was just multiply, which is obvious.