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Graphing Polar equations.notebook
1
January 10, 2014
graphing polar
equationsCh.8 Lesson 2
Graphing Polar equations.notebook
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Target
Agenda
Purpose
Evaluation
Agenda
Purpose
Evaluation
TSWBAT: convert equations to polar, graph a polar equation on the polar plane by recognizing the forms
Warm-Up/Homework Check
Lesson
Graph Matching
BAT: Extend knowledge of graphing, apply knowledge to new situations, make connections to real world patterns
3-2-1
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Converting between Polar equations and Rectangular
What rectangular should look like:
x2+y2= # or y = #x +#
What polar should look like:
r = #trigfunction...
Tools for getting to a polar equation:
1)substitute rcosθ for x and rsinθ for y
2)solve for r (divide, subtract, factor)
Tools for getting to a rectangular equation:
1)multiply by r to get r2 or get a r in the first place
or square both sides
or complete the square
2) substitute x for rcosθ and y for rsinθ
3) When given an angle only, it looks like a line, use Tanθ, solve for y
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16.
Write each rectangular equaon in polar form.
13. 14.
15.
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Write each polar equaon in rectangular form.
17. 18.
19. 20.
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Warm-Up:
1.
2.
3.
Find the rectangular coordinates for the point whose polar coordinate is (3,5π/6)
Find the polar coordinates for the point whose rectangular coordinate is (6,2)
Convert the equation to rectangular: r=4cscθ
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January 10, 2014
Graphing a polar equationFrom a rectangular graph, we are graphing the distance from the x axis at each angle
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Limacons
r = a ± b cosθ
r = a ± b sinθ
a < b
a = b
b< a< 2b
a > 2b
Limacon with inner loop
Cardioid (heart shape)
Dimpled Limacon
Convex Limacon
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Rose Curves
r = a cos nθ r = a sin nθ
if n is odd
# petals= n
if n is even
# petals= 2nr = a cos nθ r = a sin nθ
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January 10, 2014
Circles
r = a r = a cosθ r = a sin θ
a
Spiral r = aθ
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Setting up your calculator!
Mode:Float
Degree
Pol
Connected
Sequential
Real
Full
Window:θmin=0
θmax=360
θstep=15
xmin=4
xmax=4
ymin=4
ymax=4
Go back to mode
at the bottom:
change to GT
for graph and table
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r=3What type of graph is it?
Circle spiral
convex limacondimpled
limaconlimacon with inner loop
cardioid
lemniscate on xaxis
lemniscate on pole
rose on xaxis
rose off xaxis
circle around positive xaxis
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January 10, 2014
r=sin3θWhat type of graph is it?
Circle spiral
convex limacon
dimpled limacon
limacon with inner loop
cardioid
lemniscate on xaxis
lemniscate on pole
rose on xaxis
rose off xaxis
circle around positive xaxis
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January 10, 2014
r=2 + 2sinθWhat type of graph is it?
Circle spiral
convex limacon
dimpled limacon
limacon with inner loop
cardioid
lemniscate on xaxis
lemniscate on pole
rose on xaxis
rose off xaxis
circle around positive xaxis
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January 10, 2014
r=1+2cosθWhat type of graph is it?
Circle spiral
convex limacon
dimpled limacon
limacon with inner loop
cardioid
lemniscate on xaxis
lemniscate on pole
rose on xaxis
rose off xaxis
circle around positive xaxis
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January 10, 2014
r=3cosθWhat type of graph is it?
Circle circle around positive xaxis
spiral
convex limacon
dimpled limacon
limacon with inner loop
cardioid
lemniscate on xaxis
lemniscate on pole
rose on xaxis
rose off xaxis
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January 10, 2014
r=cos4θWhat type of graph is it?
Circle circle around positive xaxis
spiral
convex limacon
dimpled limacon
limacon with inner loop
cardioid
lemniscate on xaxis
lemniscate on pole
rose on xaxis
rose off xaxis
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January 10, 2014
r=1+3cos(3θ)What type of graph is it?
Circle circle around positive xaxis
spiral
convex limacon
dimpled limacon
limacon with inner loop
cardioid
lemniscate on xaxis
lemniscate on pole
rose on xaxis
rose off xaxis
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SummarizingTIME!
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Evaluation:1.
Practice! pg.548 #Do 1 skip 2 [18,1532,3540,6066], 69
r=1/√θ
r=sin(θ/2)r=θsinθ
Match the equation to the graph
set calc window:
θ min = 0,
θ max = 720,
step = 15
2. what should your x min, xmax, y min, and y max be?