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135 cm³ = (a * t / 2) * t
135 cm³ = (9 cm * 4 cm / 2) * t
135 cm³ = 18 cm² * t
135 cm³ / 18 cm² = t
t = 7,5 cm
135 = 1/2 * 4*9 * t
135 = 18 * t
t = 135 / 18
t= 7,5
catatan :
* maksudnya dikali