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jawab

gambar (1)
ΔABC siku siku di C
<BAC = 30
BC = 20 cm

AB/BC =  2x/x
AB /20 = 2
AB = 40 cm

AC/BC = x√3/ x
AC/20 = √3
AC = 20 √3

sin 30= x/2x = 1/2
cos 30 = x√3 / 2x = 1/2 √3
tan 30 = x/x√3 = 1/√3

cos 60 = x/2x = 1/2
sin 60 = x√3 / (2x) = 1/2 √3
tan 60 = x√3 /x = √3

gambar (2)
sin 45 = x/ x√2 = 1/√2 = 1/2 √2
cos 45 = x/ x√2 = 1/√2 = 1/2 √2
tan 45 = x/x = 1