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**1. Homework Statement**

Say we have the equation D

^{2}= C x N where C = A

^{2}.

Using a graphical method to find the % uncertainty of C (from graph of D

^{2}against N) which involves working out the gradient which equals C and so forth. This value is 25%.

The question is "what is the percentage uncertainty of A?"

This is actually a question that appeared in an A-level paper i did today and it was the only one that really bamboozled me .

**2. Homework Equations**

**3. The Attempt at a Solution**

I realize you don't divide by two;my reasoning being that when asked to calculate the % uncertainty of r in say the equation V = 4/3 x π x r

^{3}the question doesnt explicitly state r

^{3}.

So i think that it is between doubling 25% or just leaving it. Now i think it was the latter but in the exam I did indeed double it to 50%.