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Vector Triangle

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    Hello! I m stuck on how to draw a vector triangle on this quesiton..please help me thank you!!! ..
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    the system is in equilibrium which means the resultant force is zero.

    in a 1D system like a train on a straight track you can say that the forces acting in one direction are +ve and the forces acting in the opposite direction are -ve and just add them up to make zero.

    but what you need to do in a 2D problem like this is add the force vectors together and make them equal zero... what vector addition looks like is placing the force vectors head to tail - and the resultant is zero if you make a closed polygon (i.e. triangle)...

    so you want to draw a closed triangle of the forces acting on the mass where the vectors are all connected top to tail, then work out the lengths of the unknown vectors.
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    Name:  IMG_20160929_0001.jpg
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    i) draw T1 as shown

    ii) draw T2 nose to tail with T1

    iii) draw the 7.5 vertically down from the nose of T1*
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    Thank you both so much for taking the time to help me! Much appreciated !!
 
 
 
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