Coterminal and Reference Angles
Flashcard
•
Mathematics
•
11th - 12th Grade
•
Practice Problem
•
Hard
Standards-aligned
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15 questions
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1.
FLASHCARD QUESTION
Front
What is a reference angle?
Back
A reference angle is the acute angle formed by the terminal side of an angle and the x-axis, always measured as a positive angle.
2.
FLASHCARD QUESTION
Front
How do you find the reference angle for an angle in standard position?
Back
To find the reference angle, subtract the angle from 180° if it is in the second quadrant, subtract 180° from the angle if it is in the third quadrant, or subtract the angle from 360° if it is in the fourth quadrant.
3.
FLASHCARD QUESTION
Front
What is the reference angle for 240°?
Back
60°
4.
FLASHCARD QUESTION
Front
How do you find the reference angle for a negative angle?
Back
First, convert the negative angle to a positive angle by adding 360° until it is positive, then find the reference angle using the same rules as for positive angles.
5.
FLASHCARD QUESTION
Front
What is the reference angle for -310°?
Back
50°
6.
FLASHCARD QUESTION
Front
What is the reference angle for -30°?
Back
30°
7.
FLASHCARD QUESTION
Front
What are coterminal angles?
Back
Coterminal angles are angles that share the same terminal side when drawn in standard position, differing by full rotations of 360°.
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