SOLUTION: Trying to help my son with homework... Jon is building a wheelchair ramp at his grandmother's house. The ramp will rise 1.2 m over a run of 7.2 m. Jon will purchase roll roofing

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Question 1114022: Trying to help my son with homework...
Jon is building a wheelchair ramp at his grandmother's house. The ramp will rise 1.2 m over a run of 7.2 m. Jon will purchase roll roofing to lay on the ramp to create a non-slip surface.
a) What length of roll roofing will Jon have to purchase to cover the wheelchair ramp?
(This is as far as I got on this question)...
1.2/7/2 x100 =120/720
b)What is the angle of elevation of the ramp?
Tan0 = 120/7200
0 = tan-1(120/7200)
=9.5%
Help would be greatly appreciated
Answer by ankor@dixie-net.com(22740) (Show Source):
You can put this solution on YOUR website!
Jon is building a wheelchair ramp at his grandmother's house.
The ramp will rise 1.2 m over a run of 7.2 m.
Jon will purchase roll roofing to lay on the ramp to create a non-slip surface.
:
Find the angle using the tangent
tan(A) =
A = 9.4623 degrees is the angle
:
Find the ramp length, which is the hypotenuse (r), side opposite = 1.2
sin(9.4623) =
r =
r = 7.3 meters of no-slip roofing
:
Find the %: * 100 = 16%