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90 = (20+t) : 2
t = 90 : (20:2)
t = 90 : 10
t = 9 cm
Jadi tinggi segitiga tersebut adalah 9 cm
Semoga membantu
90 = 1/2 x 20 x tinggi
90 = 10 x tinggi
tinggi = 90 : 10 = 9 cm