Question

dont get need help! picture in comments

Answer 1

\[a^2=b^2+c^2-2bc*cos(\theta)\]\[5.7^2=10.2^2+9.8^2-2*10.2*9.8*cos(\theta)\]\[32.49=104.04+96.04-199.92*cos(\theta)\]\[199.92*cos(\theta)=104.04+96.04-32.49\]\[199.92*cos(\theta)=104.04+96.04-32.49\]\[cos(\theta)=\frac{167.59}{199.92}\]\[\boxed{cos(\theta)=0.84}\]