What is the radius of the unit circle centered at the origin?
The radius is 1.
What is the positive direction on the trigonometric circle?
Counterclockwise is the positive direction.
What does a radian measure on the unit circle?
An arc length on the unit circle.
What is the conversion relation between radians and degrees?
.
Unit circle radius
Radius is 1, circumference is 2π.
Radian-degree relation
π radians = 180°.
Coterminal angles
x + 2kπ, k in integers.
Principal measure interval
Angles in [-π, π].
Sine on circle
Vertical coordinate of point.
Cosine on circle
Horizontal coordinate of point.
Arc length of half-turn
π radians.
Answer 11 questions on Trigonometry Essentials.
1. What defines the unit circle?
2. What is the arc length of a half-turn on the unit circle?
Go over the full study guide for Trigonometry Essentials.
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