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 Find the distance from point Q to the ground (line T)  when the angle created By the left side of the seating board  and the central support is 80° .

 

 

 

 

Guest Mar 23, 2018
edited by Guest  Mar 23, 2018
edited by Guest  Mar 23, 2018
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Draw  QM intersecting  RT  at M  and parallel to T

Then.....triangle RQM  is right  with  angle RQM  = 10°

 

Then  we have that

 

sin (RQM)  =  RM / QR   

 

sin (10°)  = RM / QR   

 

QR sin (10°)  =  RM

 

Then....the height of Q above the ground is given by :

 

RT  -  RM  =

 

RT - QRsin (10° )

 

cool cool cool

CPhill  Mar 23, 2018

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