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The design for a stage is shown below. The walking ramp, PS, is 12 inches in length. What is the length of the side RP of the stage?

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sin(60) = 12/x => x= 12/sin(60)
You can use trigonometry for this. sin(60) = PS / RP PS is given as 12 in so RP = 12 / sin(60) = 13.9 in

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Other answers:

Don't bother with sin, cos and tan for this stuff, it's a waste of time...just look up the relationships for special triangles. search 30-60-90 and 45-45-90...
i concur above
i believe trigo is a very important part of maths
Nah, cause they aren't always gonna give you those angles so you needa know how to use sin/cos/tan etc

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