Geometry and TrigonometryHardRise of a road from its angle
Geometry and Trigonometry practice question
A straight section of road 40 metres long rises at an angle of 30° to the horizontal. By how many metres does the road rise over that section?
Answer: 20
40 sin 30° = 40 × 1/2 = 20.
Common wrong answers
- If you answered 80
- 80 divides by sin 30°.
- If you answered 34.6
- 34.6 uses cos 30°, the horizontal run.
- If you answered 23.1
- 23.1 uses tan 30°.
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