Given the point in cylindrical coordinates , what are its spherical coordinates ?
Table of contents
- 0. Review of College Algebra4h 45m
- 1. Measuring Angles40m
- 2. Trigonometric Functions on Right Triangles2h 5m
- 3. Unit Circle1h 19m
- 4. Graphing Trigonometric Functions1h 19m
- 5. Inverse Trigonometric Functions and Basic Trigonometric Equations1h 41m
- 6. Trigonometric Identities and More Equations2h 34m
- 7. Non-Right Triangles1h 38m
- 8. Vectors2h 25m
- 9. Polar Equations2h 5m
- 10. Parametric Equations1h 6m
- 11. Graphing Complex Numbers1h 7m
9. Polar Equations
Convert Points Between Polar and Rectangular Coordinates
Multiple Choice
Convert the point to rectangular coordinates.
(−2,−4π)
A
(2,−2)
B
(−1,1)
C
(−2,2)
D
(−22,22)
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Verified step by step guidance1
Identify the given polar coordinates: (r, θ) = (-2, -\(\frac{\pi}{4}\)).
Recall the formulas to convert polar coordinates to rectangular coordinates: x = r \(\cdot\) \(\cos\)(θ) and y = r \(\cdot\) \(\sin\)(θ).
Substitute the given values into the formulas: x = -2 \(\cdot\) \(\cos\)(-\(\frac{\pi}{4}\)) and y = -2 \(\cdot\) \(\sin\)(-\(\frac{\pi}{4}\)).
Calculate \(\cos\)(-\(\frac{\pi}{4}\)) and \(\sin\)(-\(\frac{\pi}{4}\)). Remember that \(\cos\)(-θ) = \(\cos\)(θ) and \(\sin\)(-θ) = -\(\sin\)(θ).
Simplify the expressions to find the rectangular coordinates (x, y).
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