Question

Please help! check attachment. This is grade 11 trigonometry

Answer 1

`~~~~~~~\tan \theta = \frac{\text{Perpendicular}}{\text{Base}}\\\\\\\implies \tan B = (AC)/(BC)\\\\\\\implies \tan 40^(\circ) = (10)/(a)\\\\\\\implies a = (10)/(\tan 40^(\circ))\\\\\\\implies a= 11.9~ m`