trigonometry
The law of Sines 3) (please check my answer if wrong, will need the correct answer) 4) 5) (please check my answer for #5 if wrong, will need the correct answer) 6) 7) 8) 9) 10) 11) 12) 13) 14) 15) 16) (please check my answer for #16 if wrong, will need the correct answer)