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no 2
7x+5x = 180
12x = 180
x = 180÷12
x = 15
sudut ABD = 7×15 = 105°
sudut DBC = 5×15 = 75°

no 3
5x+4x+9 = 180
9x+9 = 180
9x = 180-9
9x = 171
x = 171÷9
x = 19
sudut PQS = 5×19 = 95°
sudut SQR = 4×19+9 = 85°

no 4
3x+15 + 2x+10 = 180
3x+2x + 15+10 = 180
5x + 25 = 180
5x = 180-25
5x = 155
x = 155÷5
x = 31
sudut KLN = 3×31+15 = 108°
sudut NLM = 2×31+10 = 72°