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L = (a+b) x t x 1/2
320 = (a + b) x 16 x 1/2
160 = (a + b) x 16
10 = a + b
a = 5
b = 5
Nilai a dan b sama karena tidak ada perbandingan antara panjang sisi a dan b
CMIIW
320 = (a+b) x 16/2
320 = (a+b) x 8
a+b = 320/8
a+b = 40 cm