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FA=14cm
CB=22cm
OF=OD=22-14
=8cm
OC=√(CD²-OD²)
=√(17²-8²)
=√(289-64)
=√225
=15cm
OE=21-15
=6cm
ED=√(OD²+OE²)
=√(8²+6²)
=√(64+36)
=√100
=10cm
EF=ED=10cm
AB=OC=15cm
Keliling = ED+DC+CB+AB+AF+EF
= 10+17+22+15+14+10
= 88cm