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t= 14cm
s1=10cm
s=?
luas trapesium=jumlah sisi sejajar × tinggi
196cm²=
196=
196= (10+s2)7
(10+s2)7=196
70+7s2=196
7s2= 196-70
s2=
s2= 18
jadi panjang sisi sejajar yg lain adalah 18 cm