The Polar Coordinate System

Covers the pole, polar axis, directed angle, negative values of r, multiple representations of the same point, and the relations between polar and Cartesian coordinates.

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Views #: 124
Questions #: 10
Time: 18 minutes
Pass Score: 80.0%
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The Fixed Point of the Polar System

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θ P(r, θ) A O

The pole O, polar axis OA, and a point P(r, θ)

In the polar coordinate system, the fixed point O is called the ______ (or origin).

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The Fixed Ray of the Polar System

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The fixed ray in the polar coordinate system, usually drawn horizontally to the right from the pole, is called the polar axis or polar ______.

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Direction of a Positive Angle

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In polar coordinates (r, θ), the directed angle θ is measured positive when rotated in which direction?

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Multiple Representations of a Point

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How many different sets of polar coordinates can represent the same point?

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Meaning of a Negative r

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If r is negative in the polar coordinates (r, θ), the point lies:

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Relating Polar and Cartesian Coordinates

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P(x, y) = P(r, θ) r θ

Relating (x, y) and (r, θ)

The relation between Cartesian coordinates (x, y) and polar coordinates (r, θ) includes x = r cosθ and y =

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Deriving r-squared

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From \(x = r\cos\theta\) and \(y = r\sin\theta\), and using \(\cos^2\theta + \sin^2\theta = 1\), express \(r^2\) in terms of x and y.

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Deriving tan(theta)

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From \(x = r\cos\theta\) and \(y = r\sin\theta\) (with \(x \neq 0\)), what is \(\tan\theta\) equal to?

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Identify Equivalent Polar Coordinates

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Which of the following polar coordinate pairs all represent the same point as \((4,\ \tfrac{5}{6}\pi)\)?

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A Curve Given in Polar Form

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If a curve in a plane is expressed in polar coordinates as \(r = f(\theta)\), then along the curve:

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Year 12