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2 L = t(a+b)
t = 2 L/ a + b
ket. = a : sisi atas
b : sisi bawah
luas trapesium = j.sisi x tinggi /2
j. sisi x tinggi = l. trapesium x 2
tinggi = l. trapesium x 2 / j. sisi
maaf kalau salah :-)