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Use a graphing utility to graph the polar equations. Find the area of the given region analytically.common interior of r = 8 sin(2𝜃) and r = 4

Question

Use a graphing utility to graph the polar equations. Find the area of the given region analytically.

Common interior of
r=8sin(2θ) r = 8 \sin(2\theta)
and
r=4 r = 4
Please provide the area of the region.

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Solution

To solve this problem, we need to follow these steps:

  1. Graph the polar equations:

    • For r = 8sin(2θ), this is a rose curve with 4 petals.
    • For r = 4, this is a circle with radius 4.
  2. Find the common interior of the two graphs. This will be the area where the graphs of the two equations overlap.

  3. To find the area of the common interior analytically, we need to set the two equations equal to each other and solve for θ:

    • 8sin(2θ) = 4
    • sin(2θ) = 1/2
    • 2θ = π/6, 5π/6
    • θ = π/12, 5π/12
  4. The area of the common interior is given by the integral of 1/2 r^2 dθ from θ = π/12 to θ = 5π/12 for each of the two equations.

  5. Calculate the area for each equation and subtract to find the area of the common interior:

    • Area for r = 8sin(2θ): ∫ from π/12 to 5π/12 of 1/2 (8sin(2θ))^2 dθ
    • Area for r = 4: ∫ from π/12 to 5π/12 of 1/2 (4)^2 dθ
  6. Subtract the two areas to find the area of the common interior.

Please note that you will need a calculator to compute the integrals and the final area.

This problem has been solved

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