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keliling = 2 x jumlah sisi sejajar
56 = 2 x (3a + 4a)
56 = 2 x 7a
7a = 56/2
7a = 28
a = 28/7
a = 4
panjang sisinya
3a = 3 x 4
= 12
4a = 4 x 4
= 16, jawaban C
panjang sisi
sisi pertama =
sisi kedua =
maka yang ada jawabannya adalah 16