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168 = 1/2 x (a+b) x 16
kira2, rumusnya begini :
panjang sisi sejajar = luas x 2 : tinggi
= 168 x 2 : 16
= 21 cm
21 = a + b
a = 4/(4+3) x 21 = 4/7 x 21 = 12 cm
b = 3/(4+3)x21 = 3/7 x 21 = 9 cm