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Maka,
Dengan di kuadran II.
y = 5
r = 6
x = -√11
Didapat dari:
x = -√r²-y²
Sehingga,
Nomor 6.
Siku-siku di B, dengan sudut A = 30°
Maka,
Berlaku:
sin A = BC/AC
sin 30 = 6/AC
1/2 = 6/AC
AC = 6 x 2
AC = 12 cm [C]