Memorize Soh Cah Toa, which means:
sin = opposite/hypotenuse
cos = adjacent/hypotenuse
tan = opposite/adjacent
opposite & adjacent are determined based on the angle being referenced.
hypotenuse is ALWAYS opposite of the 90 degree angle.
sin Y = 12/13
cos Y = 5/13
tan Y = 12/5
If a=20 then 5a would be 100 because 5*20=100
Hope this helps!
In this particular question, one much understand that all angles in a triangle add up to be 180 degrees. In the 2 angles currently displayed, we have a total of 107 degrees. Subtract that from 180 and we will get 73 degrees for the unknown angle.
Answer:
It's a little blurry but I would answer if I could read it...
Step-by-step explanation: