Rearranging equations

Rearrange to make R the subject of the formula
A=π(R+r)(R-r)

Have you attempted it?

Yes

(Original post by Tgm11801)Have you attempted it?

Have you attempted it?

Well that looks fine to me, as long as the entire fraction is under the root—not just the numerator. Well done.

Well that looks fine to me, as long as the entire fraction is under the root—not just the numerator. Well done.

The sign for πr^2 is negative here and I can’t figure out the reason.

(edited 5 years ago)

The sign for πr^2 is negative here and I can’t figure out the reason.

Looks like a miscopy in the book two lines up from the bottom.

Looks like a miscopy in the book two lines up from the bottom.

Yes it is probably a miscopy,
Thank you.

(edited 5 years ago)

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