SOLUTION: Make R The Subject Of The Formula V=pi H^2(r-h/3)

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Question 975550: Make R The Subject Of The Formula V=pi H^2(r-h/3)
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Where is R? This variable is not used in the formula. How do you solve for a variable is does not occur in a formula? Cannot be done.

Your formula has r. In general, r%3C%3ER; and normally equating the two is bad algebraic practice.

You might want to solve for r.
Where is r? In the right member of the equation.
-
Undo the last thing, read that carefully, the LAST THING done to r.
This would be to use multiplicative inverse of pi%2AH%5E2.

V%281%2F%28pi%2AH%5E2%29%29=pi%2AH%5E2%28r-h%2F3%29%281%2F%28pi%2AH%5E2%29%29
V%2F%28pi%2AH%5E2%29=r-h%2F3
Next, what to undo? Use additive inverse of -h%2F3;
V%2F%28pi%2AH%5E2%29%2Bh%2F3=r-h%2F3%2Bh%2F3
highlight%28V%2F%28pi%2AH%5E2%29%2Bh%2F3=r%29