Sine & Cosine Quiz (5 Questions)
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True or False: sin 30° = cos 60°
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θ = 45°. Find sin(90° − θ).
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True or False: sin θ + cos θ = 1
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θ = 20°. Find cos(90° − θ)
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Give a real-life example using complementary angles.
Answer Key
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True
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sin 45° = √2/2
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False
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cos 70° ≈ 0.3420
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Engineering angles, ramp slopes, navigation, architecture