Solve the Quadratic Equation A = pi*r^2 for r

Solve the Quadratic Equation A = pi*r^2 for r

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Thank you:)

[unformidable]

you have a very clear teaching style! I understood completely after you taught it! Amazing work!

[santanadelgado]

Thanks man I was having trouble on that one

[qpidsarrows]

if you solve for pi, then would answers switch?