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maka,
L = a x t /2
135 = 6ax5a/2
135 x 2 = 30 a2
270 = 30 a2
a2 = 270/30
a2 = 9
a =3
135. = 1/2 . 6x.5x
135 = 15x^2
135 : 15 = x^2
9. = x^2
x. = √9
x. = 3
jadi alas = 6x. = 6(3)= 18 cm
tinggi = 5x = 5(3) = 15 cm