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December 18, 2014

December 18, 2014

Posted by **Abbey(Please help)** on Friday, April 30, 2010 at 3:57pm.

(-1 , -3pi/4)

I do not understand.

- Math -
**Reiny**, Friday, April 30, 2010 at 5:49pmAre you more comfortable thinking in degrees?

-3π/4 radians = -135° ( clockwise)

-135 is coterminal with +225°

so we could write our point as

(-1,225°)

which is the same as (+1 , +45°)

so x = cos45/1 = √2/2

y = sin45/1 = √2/2

the point is (√2/2,√2/2)

- Math -
**Abbey(Please help)**, Friday, April 30, 2010 at 6:10pmThank You!

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