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SA=πr^2-πr solve for r
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1 vote
SA=πr^2-πr solve for r

User Lei Lei
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7.9k points

1 Answer

3 votes
a great time to apply the quadratic formula
for a quadratic equation
Ax^2 + Bx +C =0

then

x= (-b\pm √(b^2-4ac))/(2a)
User Yagger
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