SOLUTION: Make R the subject of the formula A={{{pi ("R-r"/2)^(2) }}} The second two is a power

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Question 824972: Make R the subject of the formula
A=pi+%28%22R-r%22%2F2%29%5E%282%29+
The second two is a power
Found 2 solutions by jim_thompson5910, josmiceli:
Answer by jim_thompson5910(35256) About Me  (Show Source):
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+A+=+pi%2A%28%28R+-+r%29%2F2%29%5E%282%29+
Divide both sides by +pi+
+A%2Fpi+=+%28%28R+-+r%29%2F2%29%5E%282%29+
Take the square root of both sides
+sqrt%28+A%2Fpi+%29+=+%28+R-r+%29%2F2+
Multiply both sides by +2+
+2%2Asqrt%28+A%2Fpi+%29+=+R-r+
Add +r+ to both sides
+2%2Asqrt%28+A%2Fpi+%29+%2B+r+=+R+