Jawabanmu

2014-08-22T23:14:13+07:00
Sn = a + a + 1 + a + 2
36   = 3a + 3
36 - 3 = 3a + 3 - 3
3a = 33
a = 11
alas = 11
tinggi = 11 +1 = 12
g. miring = 13
luas = a*t : 2
        =   11 * 12 : 2
         = 66