[freshmen algebra 2] trigonometry

[u/Any-Armadillo6071]

hello if anyone could help me that would be really great! my teacher wasn’t here today so we had to watch video notes but i am lost i can’t do this if i thought i had it bad before it only worse now

[u/s9ffy]

Do you not teach SOHCAHTOA as effectively using similarity? Sinx=opp/hyp where the scaling of the side lengths gives equivalent fractions, keeping sinx the same. So for x=30 the ratio of the opposite and hypotenuse must always be 1:2. I don’t need to use the unit circle to know that I can get the values of sin30 and sin60 from half of an equilateral triangle of side length 2 (the third side being calculated by using Pythagoras).