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55 = (8+b) x 5 / 2
55 = (40+5b) / 2
55 x 2 = 40 + 5b
110 = 40 + 5b
110 - 40 = 5b
70 = 5b
70/5 = b
14 = b
.jadi sisi sejajar satunya 14cm
= 22 - 8
= 14
sisi sejajar lainnya = 14 cm