Jawabanmu

2014-01-26T16:59:44+07:00
AD=BC
BD=AC
CG=AE

BD = √AB²+AD²
=√12²+9²
=√144+81
=√225 = 15cm

CE = √AC²+AE²
=√15²+8²
=√225+64
=√289 = 17cm
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