Posted by **Jack** on Monday, September 5, 2011 at 5:03pm.

Find the distance between P1(3, –195°) and P2(–4, –94°) on the polar plane. Round your answer to the nearest thousandth.

- PreCal -
**Reiny**, Monday, September 5, 2011 at 5:44pm
P2(-4,-94°) can also be written a (4,94°)

Make a sketch to see that you have two straight lines with vertex at the origin of lenghts 3 and 4 with an angle of 79° between them.

by the cosine law:

(P1P2)^2 = 3^2 + 4^2 - 2(3)(4)cos 79°

= 20.42056

P1P2 = 4.519

- PreCal -
**Tim**, Monday, September 5, 2011 at 5:59pm
Thanks, I am understanding now.

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