calculate the size of angle PRQ

Suggestion:
1. Use triangle PQN and an appropriate trig ratio to find PN in terms of x
2. Then use triangle PRN and an appropriate trig ratio to find angle at R
 
thanks so much! I think I've done it!

PN = x * sin30

Tan R = x( sin30 ) / 3x

Tan R = ( sin30 ) / 3 = 1/6

R = tan-1 ( 1/6 )

R = 9.5 degrees

which is correct :D
 
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