plisss dijawab kk ku

7. BC/DE = AB/AD
6/9 = 4/AD
6AD = 9x4
6AD = 36
AD = 36/6
AD = 6 CM

8. Segitiga - segitiga yang kongruen :
DEA = CEB
DEC = AEB
DCB = DAB = CBA = CDA

9. <PQR = 50 derajat
<QRP = 60 derajat

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