MCQ practice · SSC Higher Mathematics Board questions · Chapter 8: Trigonometry
What is the circular measure of the angle 90°?
Think it through first, then pick an option.
- a πᶜ/6
- b πᶜ/4
- c πᶜ/3
- d πᶜ/2
Answer and explanation
Correct answer: d πᶜ/2
90° = 90 × π/180 = π/2.
Why the other options are wrong
- a πᶜ/6: 30° = π/6, not 90°; it is a different quantity from the one asked for.
- b πᶜ/4: 45° = π/4, not 90°; it is a different quantity from the one asked for.
- c πᶜ/3: 60° = π/3, not 90°; it is a different quantity from the one asked for.
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