Explanation:
1st we want to find the measure of <1 so we use cos
cos( 1 ) =18/30
cos( 1 ) =18/30 cos (1) = 0.6
cos( 1 ) =18/30 cos (1) = 0.61= cos^-1(0.6)
cos( 1 ) =18/30 cos (1) = 0.61= cos^-1(0.6)1° = 53.13° so the angle of 1 is 53.13°
2nd we can solve angle 2 by using sin
sin(2) = 18/30
sin(2) = 18/30 sin(2) = 0.6
sin(2) = 18/30 sin(2) = 0.62 = sin^-1(0.6)
2 = 36.869° round to 36.87°
so the angle 2 is 36.87°