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jmlah sisi sejajar = k : 2 = 100 : 2 = 50
p = 3/7 x 50 = 21 3/7 cm
l = 4/7 x 50 = 28 4/7 cm
100 = 2(p + l)
50 = p + l
50 = 3x + 4x
50 = 7x
x = 7
p = 3x = 21 cm
l = 4x = 28 cm