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14*2=28
28-15=13
sisi sejajar lain nya adlh 13 cm
196 = (15 + b ) x 14/2
196 = (15 + b) x 7
196/7 = 15 + b
28 = 15 + b
b = 28 -15
b =13 cm
Jadi, sisi sejajar lainnya adalah 13 cm