tolong bantu kk. gak ngerti do kk

sin A= 3/7
sin A = y/r
x^2 = r^2 - y^2
x^2 = 7^2 - 3^2
x^2 = 49 - 9
x^2 = 40
x = √40
x = 2√10
cos A = x/r = 2√10/7 = (2/7)√10
tan A = y/x = 3/2√10 = (3√10)/20
csc = r/y = 7/3
sec = r/x = 7/2√10 = (7√10)/20
cotan = x/y = (2√10)/3 = (2/3)√10