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1/2 x 20x^2 = 160
10x^2 = 160
x^2 = 16
x = 4
tinggi = 4x = 4 x 4 = 16 cm
maaf klo salah
luas 160cm²
160 : ((5 + 9) x 2) =160 : 28 = 5,71428
jadi tingginya ialah 5,71428 x 4 = 22,851712 cm