Jawabanmu

2014-04-20T17:50:57+07:00
AC : 14 cm
AO : 1/2 AC = 1/2 × 14 = 7 cm
keliling = 100 cm
        4 × AB = 100
             AB = 25

BO = √25² - 7²
         √625 - 49
           √ 576= 24
BD = 2 × 24 = 48

luas belah ketupat = 1/2 × 14× 48 = 336 cm²

dicek lagi :) . semoga membantu :)
2014-04-20T17:51:00+07:00
Sisi miring=kll÷4=100÷4=25......... 1/2d2=√25^2-7^2=√625-49=√576=24...... d2=2×24=48......... L=1/2d1d2=1/2×14×48=7×48=336