Geometry and TrigonometryVery hardAngle from a sine-cosine identity
Geometry and Trigonometry practice question
For acute angles, sin 35° = cos k°. What is the value of k?
Answer: 55
sin θ = cos(90° − θ), so k = 90 − 35 = 55.
Common wrong answers
- If you answered 35
- 35 repeats the angle.
- If you answered 65
- 65 subtracts from 100.
- If you answered 145
- 145 uses 180 instead of 90.
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