sudut MNK = MLK = 90°
sudut MNK = 3b+12
90 = 3b +12
90-12 =3b
b = 78/3
b = 26°
sudut MLK = 7a-1
90 = 7a-1
90+1 =7a
a = 91/7
a = 13
jadi nilai a-b= 13-26=-13 (A)
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sudut MNK = MLK = 90°
sudut MNK = 3b+12
90 = 3b +12
90-12 =3b
b = 78/3
b = 26°
sudut MLK = 7a-1
90 = 7a-1
90+1 =7a
a = 91/7
a = 13
jadi nilai a-b= 13-26=-13 (A)