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QLDMath MethodsQuick questions
Unit 2: Calculus
Quick questions on Radian measure and the unit circle (QCE Math Methods Unit 2)
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is using degrees in arc-length or sector formulas?Show answer
Both formulas require radians.
What is computing reference angles from the wrong axis?Show answer
Reference angles are always measured from the nearest $x$-axis, not from the nearest axis in general.
What is forgetting quadrant signs?Show answer
Even with the correct reference angle, the sign must come from the quadrant.
What is confusing $\pi$ with the number $\pi \approx 3.14$?Show answer
A common multiple-choice trap. $\sin(\pi)$ is $\sin$ of an angle of $\pi$ radians (which is $180°$ and equals $0$), not $\sin(3.14)$ in degree mode.
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