Write parametric equations for the rectangular equation below.
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
10. Parametric Equations
Writing Parametric Equations
Problem 5.5.45
Textbook Question
In Exercises 45–52, use your answers from Exercises 41–44 and the parametric equations given in Exercises 41–44 to find a set of parametric equations for the conic section or the line.
Circle: Center: (3,5); Radius: 6
Verified step by step guidance1
Recall the standard parametric equations for a circle with center \((h, k)\) and radius \(r\):
\[ x = h + r \cos(t) \]
\[ y = k + r \sin(t) \]
Identify the center \((h, k)\) and radius \(r\) from the problem: center \((3, 5)\) and radius \(6\).
Substitute these values into the parametric equations to get:
\[ x = 3 + 6 \cos(t) \]
\[ y = 5 + 6 \sin(t) \]
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Parametric Equations of a Circle
Parametric equations represent a circle by expressing x and y coordinates as functions of a parameter, usually t. For a circle centered at (h, k) with radius r, the equations are x = h + r cos(t) and y = k + r sin(t), where t varies from 0 to 2π.
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Understanding the Center and Radius
The center (h, k) of a circle determines its position on the coordinate plane, while the radius r defines its size. These values are essential for constructing the parametric equations, as they shift and scale the standard unit circle equations accordingly.
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Introduction to the Unit Circle
Parameter Range and Interpretation
The parameter t typically represents an angle in radians and varies from 0 to 2π to trace the entire circle once. Understanding this range helps in visualizing the motion along the circle and ensures the parametric equations cover all points on the circle.
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Eliminating the Parameter
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