13-3 Radian Measure
Objectives
To use radian measure for angles
To find the length of an arc of a circle
Lesson Vocabulary
- central angle
- intercepted arc
- radian
A central angle of a circle is an angle with a vertex at the center of a circle. An intercepted arc is the portion of the circle with endpoints on the sides of the central angle and remaining points within the interior of the angle.
A radian is the measure of a central angle that intercepts an arc with length equal to the radius of the circle. Radians, like degrees, measure the amount of rotation from the initial side to the terminal side of an angle.
Essential Understanding An angle with a full circle rotation measures 2π radians. An angle with a semicircle rotation measures π radians.
Take Note Key Concept: Proportion Relating Radians and Degrees
You can use the proportion
Table of Contents
- 5-1 Polynomial Functions
- 5-2 Polynomials, Linear Factors, and Zeros
- 5-3 Solving Polynomial Equations
- 5-4 Dividing Polynomials
- 5-5 Theorems About Roots of Polynomial Equations
- 5-6 The Fundamental Theorem of Algebra
- 5-7 The Binomial Theorem
- 5-8 Polynomial Models in the Real World
- 5-9 Transforming Polynomial Functions