Practice Flashcards
Flip to reveal answersWhat is one radian?
Track your progress — Sign up free to save your progress and get smart review reminders based on spaced repetition.
All 9 Flashcards — Radian measure
Sign up free to track progress and get spaced-repetition review schedules.
Question
What is one radian?
Answer
The angle at the centre of a circle whose arc length equals the radius.
Question
How many radians in a full circle?
Answer
2π (and π in a half circle, 180°).
Question
Convert degrees to radians?
Answer
Multiply by π/180.
Question
Convert radians to degrees?
Answer
Multiply by 180/π.
Question
Radian values of 30°, 45°, 60°, 90°?
Answer
π/6, π/4, π/3, π/2.
Question
60° in radians?
Answer
60 × π/180 = π/3.
Question
3π/4 radians in degrees?
Answer
3π/4 × 180/π = 135°.
Question
Why must the GDC mode match?
Answer
sin/cos of a radian angle need radian mode; a mode mismatch gives wrong values.
Question
Which mode does calculus with sin/cos use?
Answer
Radians.
Read the notes
Full study notes for Radian measure
Topic 3.4 hub
Radians, arcs & sectors
More from Topic 3.4
All flashcards in this topic
Math AA SL exam skills
Paper structures & tips
Track your progress with spaced repetition
Sign up free — Aimnova tells you exactly which cards to review and when, so you remember everything before your IB exam.
Start Free