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

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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