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October 7, 2015
Posted by **G** on Friday, November 9, 2012 at 3:09pm.

- Precalculus -
**Reiny**, Friday, November 9, 2012 at 3:47pmwe know that x^2 + y^2 = r^2

so y^2 = r^2 - x^2

also sinØ = x/r

x = rsinØ

x^2 = r^2 sin^2 Ø

so y^2 + 8x = 0

r^2 - x^2 + 8x = 0

r^2 - r^2 sin^2 Ø + 8r sinØ = 0