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(15 + 11) * tinggi / 2 = 104 cm^2
26 * tinggi / 2 = 104 cm^2, 26 dicoret sama 2nya
13 * tinggi = 104 cm^2
tinggi = 104 cm^2 dibagi 13
tinggi = 8 cm
104 = (15+11) per 2 X t
104 = 26/2t
104 = 13t
t = 104/13
t = 8 cm