Tolong dijawab no.2,4&5 sekalian dengan cara kerja Thanks

2. luas ABC = 1/2. alas.tinggi
= 1/2.16 cm.12 cm
= 96 cm^2
3. alas: tinggi = 5:4
luas segitiga = 160 cm^2
1/2.a.t. = 160
1/2.(5/4.t).t. = 160. (a = 5/4.t)
.t^2. = 160.8/5
= 256
t. =√256
t = 16