Jawabanmu

2014-05-09T22:32:51+07:00
Sisi AB = AD
54-(2x17)=
54-34 = 20 cm :2
AB= 10 cm
  Diagonal BD = 8 cm x 2 = 16 cm
OC = 15 cm
 luas = 16 x 21
             2
luas = 168 cm²
2014-05-09T22:33:14+07:00
Keliling 54 = 17+17+AD+AB
           20 = 2x
           10 = x
   BD=  10^{2}  -  6^{2}  = 8
   CO=  17^{2}  -  8[tex] 8^{2}
       = 15

 \frac{1}{2} x 21 x 16
=168  cm^{2}