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L=(a*t/2)*t
3.000=(10*15/2)*t
3.000=(150/2)*t
3.000=75*t
t=3.000/75=40cm
semoga membantu
3000 = ½ x 10 x 15 x t
= 5 x 15 x t
t = 3000 : 75
= 40 cm