Posted by **Lucelys** on Wednesday, September 23, 2009 at 7:30pm.

So in physical science i'm learning about vectors using the pythagoream theorem, and when i get what c equal i wanted to know if i round to the next highest number, put it is a decimal, or do nothing at all. Helppp pleaeee[:

- physics -
**MathMate**, Wednesday, September 23, 2009 at 9:08pm
It depends on the problem.

If the two orthogonal components (at right angles) are given to 4 significant figures, your answer should do the same.

For example,

x=42.34

y=55.31

z=√(x²+y²)

=(69.65578)

But 69.65578 has 7 significant figures, which is more than the original information, so round to the same number of figures, namely 69.66 would do.

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