Question

The figure below is not drawn to scale.

Find correct to 1 decimal place;

1. Length PQ. 
2. Angle ABC 

Answer 1

1.  7.62 + 4.82 – 2 x 7.6 x 4.8 cos 80
   = 57.76 + 23.04 – 12.67
   = 68.13 
   R = 68.13
   = 8.3
2. ^{Sin B}/_4.8 = ^{Sin 80}/_8.254
   Sin B = 0.5727
   B = sin -10.5727
   = 34.9°