If the sin 30 degrees is 1/2, then the cos
Sin 30 degrees = 1 / 2 = opposite / hypotenuseAdjacent^2 = hyp^2 - opp^2Adj^2 = 4 - 1Adj^2 = 3Adj = sq root (3)cosine 30 degrees = adjacent / hypotenusecosine 30 degrees = sq root (3) / 2cosine 30 degrees = 1.732 / 2cosine 30 degrees = .866