Unit-circle trigonometry
Circles and trigonometry · Stage 4
Recognize the pattern
A unit-circle point has coordinates (cos θ, sin θ).
Useful rule(cos θ, sin θ)
Try it before reading the solution
On the unit circle, what point corresponds to θ=π/2?
This teaching example is original and is not an official SAT question.
Reasoning
cos(π/2)=0 and sin(π/2)=1.
Answer(0, 1)
03 · Next step
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Practice questions remain in English, as on the SAT.