trig unit circ

FarrO:

sin(x) = 2/8
cos(x) =?
how to

Draw a right angled triange.
Mark one of the acute angles as x
Put 2 on the opp side adn 8 on the hyp (because sin = opp/hyp)
Use pythagoras theorem to find the adjacent side
read cos(x) off your triangle.