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AE = 1/2 12
AE = 6 cm
*Cari AD menggunakan pitagoras
AD = √AE^2 + DE^2
AD = √6^2 + 8^2
AD = √36 + 64
AD = √100
AD = 10 cm
AD = BC
Keliling = AB + BC + CD + DA
Keliling = 24 + 10 + 12 + 10
Keliling = 56 cm