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CD = 17
titik potong di tengah (o)
OD = 8
Oc = 15
OC dan OD mengunakan angka trialnya phytagoras
AO = 21-15
= 6
maka
AD = √ 8² + 6²
= √64+36
AD =√100
AD = 10
keliling layang layang = AB +BC+CD+DA
hasilnya = 54