Jawabanmu

2014-06-06T22:17:23+07:00
L= 1/2 x a x t
135 = 1/2 x 18 x t 
135 = 9 x t
t = 15 cm  
semoga membantu... maaf kl salah...
bener
2014-06-06T22:17:27+07:00
Luas segitiga = A×t :2
135 = 18×T : 2
135 = 9×T
135:9 = T
15 = T
tingginta 15