Geometry and TrigonometryHardLength of a gentle ramp
Geometry and Trigonometry practice question
A wheelchair ramp rises 1 metre and makes an angle of 5° with the ground. To the nearest metre, how long is the ramp?
Answer: 11
The ramp is the hypotenuse: 1/sin 5° ≈ 11.5, which rounds to 11.
Common wrong answers
- If you answered 1
- 1 is the rise.
- If you answered 20
- 20 guesses a 1-in-20 gradient, which would be about 3°.
- If you answered 57
- 57 uses 1/tan 1° or a degree-to-radian slip.
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