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panjang BE=ED=9cm
panjang AB=BC=CD=AD=
=15 cm
Sudut BAD=BCD=50 derajat
Sudut ABC+ADC=360 derajat-(2x50 derajat)
=360-100
=260 derajat
Maka sudut ABC=ADC=260:2=130 derajat
tengah