i have no idea how to solvethis wud sum1 plz help me!
πr2 = 21
pi x r"2" = 21
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i have no idea how to solvethis wud sum1 plz help me!
πr2 = 21
pi x r"2" = 21
What is the question? Is it rearrange this to something like r= some expression possibly in terms of 21 and pi ...?
Divide both sides by $\displaystyle \pi$ to get:
$\displaystyle r^2=\frac{21}{\pi}$
Now take the sqruare root (we want the positive root because $\displaystyle r$ is presumably the radius of a circle):
$\displaystyle r=\sqrt{\frac{21}{\pi}}$
RonL