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B.keliling 1/2 lingkaran +keliling trapesium
k 1/2 lingkaran = 1/2 x 2 x x r = 1/2 x 2 x 22/7 x 7 = 22
k trapesium mencari sama kaki pake pythagoras . sehingga hasil nya itu 5
kelilingnya 20+10 =30
keliling total= 30+22=52