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Section 10.2

Section 10.2. Polar Equations and Graphs. HORIZONTAL AND VERTICAL LINES. The graph of r sin θ = a is a horizontal line a units above the pole if a is positive and | a | units below the pole if a is negative.

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Section 10.2

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  1. Section 10.2 Polar Equations and Graphs

  2. HORIZONTAL AND VERTICAL LINES • The graph of r sin θ= a is a horizontal line a units above the pole if a is positive and |a| units below the pole if a is negative. • The graph of r cos θ= a is a vertical line a units to the right of the pole if a is positive and |a| units to the left of the pole if a is negative.

  3. POLAR EQUATIONS OF CIRCLES • The equation r = a is a circle of radius |a| centered at the pole. • The equation r = acos θ is a circle of radius |a/2|, passing through the pole, and with center on θ = 0 or θ = π. • The equation r = asin θ is a circle of radius |a/2|, passing through the pole, and with center on θ = π/2 or θ = 3π/2.

  4. ROSE CURVES The equations r = bsin(aθ) r = bcos(aθ) both have graphs that are called rose curves. • The rose curve has 2a leaves (petals) if a is an even number. • The rose curve has a leaves (petals) if a is an odd number. • The leaves (petals) have length b.

  5. LIMAÇONS The graphs of the equations r = a± bsin θ r = a ± bcos θ are called limaçons. • If |a/b| < 1, then the limaçon has an inner loop. For example: r = 3 − 4cos θ. • If |a/b| = 1, then the limaçon is a “heart-shaped” graph called a cardiod. For example: r = 3 + 3sin θ.

  6. LIMAÇONS (CONTINUED) • If 1 < |a/b| < 2, then the limaçon is dimpled. For example: r = 3 + 2cos θ. • If |a/b| ≥ 2, then the limaçon is convex. For example: r = 3 − sin θ.

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