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b = 15 m
t = 8 m
Luas = 1/2 (a+b) x t
= 1/2 (20+15) x 8
= 1/2 x 35 x 8
= 140 m2
35/100 x 4 = 140
7/20 x 4 =140
7/5=140
1/5=20
Terbukti salah, Kalo sisi sejajarnya meter baru bener, tinggal ilangin per 100nya