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POLAR CURVES
SPECIFIC OBJECTIVES: At the end of the lesson, the student is expected to be
able to: • define polar coordinates. • plot points polar coordinates. • write and sketch the graphs of polar equa=ons. • convert polar to rectangular and vice versa.
Examples: Plot the given points on a polar coordinate system. a. P (3, 45°)
b. P (3, –60°)
c. P (–3, 220°) d. P (-‐3, –75°)
RELATIONS BETWEEN RECTANGULAR AND POLAR COORDINATES
The transforma=on formulas that express the rela=onship between rectangular coordinates and polar coordinates of a point are as follows:
and
Also, ; ;
2. Express the rectangular coordinates (-‐4, 3) in terms of polar coordinates.
Cardiod Limacon
Eight – leaf Rose Three – leaf Rose
Spiral of Archimedes Logarithmic Spiral
Lemniscate
30° 60° 90° 120° 150° 180° 210° 240° 270° 300° 330° 360°
1 0.87 0.5 0 -‐0.5 -‐0.87 -‐1 -‐0.87 -‐0.5 0 0.5 0.87 1
2 1.73 1 0 -‐1 -‐1.73 -‐2 -‐1.73 -‐1 0 1 1.73 2
r 3 2.73 2 1 0 -‐0.73 -‐1 -‐0.73 0 1 2 2.73 3