أحتاج مساعدة في سؤال بخصوص الكثافة؟!
 

I'm not asking you without trying to solve it myself, here's the question 1st:

If the three quantities; mass, diameter, and height for a cylinder are measured with the same percentage error, which would contribute the most to the error in the density?

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so, I tried to answer it like this:
since the equation for the cylinder density is p=2*M/(pi*d^2*h)
well, according to this the mass and the height aren't squared the error would remain the same, however the diameter is squared which means the error is squared as well.. so it's the diameter!!!!

BUT my friend says since p(density)=M/V , then mass would contribute the most not diameter ;O

HELP PLEASE , I dont know which answer to put in our report D:?!