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1/2 × (a+b) × t = 120
1/2 × (12+18) × t = 120
1/2 × 30 × t = 120
15t = 120
t = 120 : 15
t = 8 cm
120=1\2(18+12).t
120=1\2(30).t
120=15.t
t=120\15
t=8
maaf klo salah jawabannya