Jawabanmu

2014-08-31T11:03:10+07:00
1. AD=√AE^2+ED^2=√16+9=√25=5 (pythagoras)
CD=√ED^2+EC^2=√9+4=√13 (pythagoras)

2. EC/ED=BD/CD
2/3=BD/√13
BD=2√13/3Cm

3. BC=√CD^2+BD^2=√13+52/9=√169/9=13/3cm
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