Jawabanmu

2014-06-10T08:31:57+07:00
Luas permukaan
= 2 x la + ka x t
= 2 x (5 x 12 : 2) + ( 5 + 12 + 13) x 8
= ( 2 x 30) + ( 30 x 8 )
= 60 + 240
= 300 cm²
2014-06-10T09:09:29+07:00
LP=(2*Lalas)+(kll alas*tprisma)
(2*5*12/2) + ((5+12+13)*8)
60+240
300 cm²