Jawabanmu

2014-02-07T11:17:13+07:00
 a. Luas = 4 x  ((12/2)x(6/2) / 2 )
             = 36 cm²

 b. keliling = 4 x 7
                = 28 cm
2014-02-07T11:17:38+07:00
A. luasnya = 1/2 x 12 x 6 = 6 x 6 = 36. b. kelilingnya = 4 x 7 = 28.