SA=πr^2-πr solve for r

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asked Feb 26, 2018 137k views

1 vote

SA=πr^2-πr solve for r

Mathematics
high-school

Lei Lei asked

by Lei Lei

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1 Answer

3 votes

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

then

$x= (-b\pm √(b^2-4ac))/(2a)$

Yagger answered Mar 4, 2018

by Yagger

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