section 8.6 some equations in rectangular form are easier...

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sect8_6.notebook 1 December 04, 2018 Some equations in rectangular form are easier to graph in polar form, and some equations in polar form may be easier to graph in rectangular form. Section 8.6

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Page 1: Section 8.6 Some equations in rectangular form are easier ...turnereducational.com/cuesta/m229/lectures/sect8_6.pdf · sect8_6.notebook 5 December 04, 2018 A more advanced method

sect8_6.notebook

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December 04, 2018

Some equations in rectangular form are easier to graph in polar form, and some equations in polar form may be easier to graph in rectangular form.

Section 8.6

Page 2: Section 8.6 Some equations in rectangular form are easier ...turnereducational.com/cuesta/m229/lectures/sect8_6.pdf · sect8_6.notebook 5 December 04, 2018 A more advanced method

sect8_6.notebook

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December 04, 2018

EX: Graph the equation x2 + y2 = 4

Page 3: Section 8.6 Some equations in rectangular form are easier ...turnereducational.com/cuesta/m229/lectures/sect8_6.pdf · sect8_6.notebook 5 December 04, 2018 A more advanced method

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December 04, 2018

EX: Graph the equation r = 3cscθ

Page 4: Section 8.6 Some equations in rectangular form are easier ...turnereducational.com/cuesta/m229/lectures/sect8_6.pdf · sect8_6.notebook 5 December 04, 2018 A more advanced method

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December 04, 2018

To graph equations in polar form on the polar coordinate system, the most basic method is to find a bunch of ordered pairs (r, θ ) and plot points.

EX: Make a table of ordered pairs for r = 4cos(3θ ), and then graph the equation by plotting points.

Page 5: Section 8.6 Some equations in rectangular form are easier ...turnereducational.com/cuesta/m229/lectures/sect8_6.pdf · sect8_6.notebook 5 December 04, 2018 A more advanced method

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December 04, 2018

A more advanced method of graphing polar equations by hand is to first graph the equation in an rθ rectangular coordinate system, and then translate this information onto a polar coordinate system.

Page 6: Section 8.6 Some equations in rectangular form are easier ...turnereducational.com/cuesta/m229/lectures/sect8_6.pdf · sect8_6.notebook 5 December 04, 2018 A more advanced method

sect8_6.notebook

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December 04, 2018

EX: Graph the equation r = 4 − 5sinθ

Page 7: Section 8.6 Some equations in rectangular form are easier ...turnereducational.com/cuesta/m229/lectures/sect8_6.pdf · sect8_6.notebook 5 December 04, 2018 A more advanced method

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December 04, 2018

EX: Graph the equation r = 5sin(4θ )

Page 8: Section 8.6 Some equations in rectangular form are easier ...turnereducational.com/cuesta/m229/lectures/sect8_6.pdf · sect8_6.notebook 5 December 04, 2018 A more advanced method

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December 04, 2018

We can use the TI­84 to make a table of ordered pairs, but we must first put the calculator in polar mode.

Page 9: Section 8.6 Some equations in rectangular form are easier ...turnereducational.com/cuesta/m229/lectures/sect8_6.pdf · sect8_6.notebook 5 December 04, 2018 A more advanced method

sect8_6.notebook

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December 04, 2018

Of course, the graphing calculator can graph the equation as well. 

Page 10: Section 8.6 Some equations in rectangular form are easier ...turnereducational.com/cuesta/m229/lectures/sect8_6.pdf · sect8_6.notebook 5 December 04, 2018 A more advanced method

sect8_6.notebook

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December 04, 2018

Types of Polar Graphs

Page 11: Section 8.6 Some equations in rectangular form are easier ...turnereducational.com/cuesta/m229/lectures/sect8_6.pdf · sect8_6.notebook 5 December 04, 2018 A more advanced method

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December 04, 2018

Page 12: Section 8.6 Some equations in rectangular form are easier ...turnereducational.com/cuesta/m229/lectures/sect8_6.pdf · sect8_6.notebook 5 December 04, 2018 A more advanced method

sect8_6.notebook

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December 04, 2018