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=12x+12=180
=12x+12-12=180-12
=12x=168
=x=14
sudut PQR=7X×14+8=106
18.sudut B=180-112=68
besar sudut BCA=180-68-42=70
19.(8x-20)+(4x+8)=180
=12x-12=180
=12x-12+12=180+12
=12x=192
=x=16
sudut COB=4X×16+8=72
sudut COB pelurus dari sudut AOC.
20.sudut x=180-85-35=60