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15-5=10(tinggi)
L= 75 cm2
L = 1/2 a x t
75= 1/2 a x(a-5)
75 x 2 = a x (a-5)
150 = a^2 -5a
a^2 -5a -150 = 0
(a-15) (a+10) = 0
a-15 = 0 => a=15
a+10 =0 => a = -10
a=15
t=15-5 = 10