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keliling=13.4
=52 cm
db=do+ob (do=ob)
ab=bc=cd=da
a. ob =√ab²-oa²
=√13²-5²
=√169-25
=√144 =12 cm
bd=do+ob
=12+12
=24 cm
b. k=jumlah semua sisi
=ab+bc+cd+da
=13+13+13+13
=52 cm