Asked by Cherie

Lombard Street in San Francisco is a switchback road with a speed limit of 8km/hr because if it’s extreme grade. The angle of elevation of Lombard Street in one section reaches 15°. Determine the grade of this section of road.
Please help. I’ve tried drawing out diagram but I am stuck . Thank you!
Answered by oobleck
the grade is the tangent of the angle.
tan15° = 0.2679 or about 27%
pretty steep!
Answered by Cherie
Thank you for your help :)
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