18.1.
cos30 = x/6
x = cos30*6 = sqrt(3)/2 * 6 = 3*sqrt(3)
sin30 = y/6
y = sin30*6 = 1/2 * 6 = 3
18.2.
sin30 = x/10
x = sin30*10 = 1/2 * 10 = 5
cos30 = y/10
y = cos30*10 = sqrt(3)/2 * 10 = 5*sqrt(3)
19.1.
sin60 = x/6
x = sin60*6 = sqrt(3)/2 * 6 = 3*sqrt(3)
cos60 = y/6
y = cos60*6 = 1/2 * 6 = 3
19.2.
cos60 = x/10
x = cos60*10 = 1/2 * 10 = 5
sin60 = y/10
y = sin60*10 = sqrt(3)/2 * 10 = 5*sqrt(3)