Side adjacent to the given angle: x Diagonal=hypotenuse=20 cos (36° 42') =(side adjacent to angle 36° 42')/Hypotenuse cos (36° 42')=x/20 Solving for x. Multiplying both sides of the equation by 20: 20 cos (36° 42')=20 (x/20) 20 cos (36° 42')=x x=20 cos (36° 42') x=20 (0.801775644) x=16.03551288 x=16.04
