# Calc10_5 - 10.5 Polar Coordinates Greg Kelly Hanford High...

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10.5: Polar Coordinates Greg Kelly, Hanford High School, Richland, Washington

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One way to give someone directions is to tell them to go three blocks East and five blocks South. Another way to give directions is to point and say “Go a half mile in that direction.” Polar graphing is like the second method of giving directions. Each point is determined by a distance and an angle. θ Initial ray r A polar coordinate pair determines the location of a point. ( 29 , r θ
1 2 0 2 r π θ r a = o θ θ = (Circle centered at the origin) (Line through the origin) Some curves are easier to describe with polar coordinates:

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30 o 2 More than one coordinate pair can refer to the same point.

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