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kel setengah lingkaran = 1/2 x 2 x π x r
= π x r
= 22/7 x 7
= 22 cm
kel bangun datar = 25 + 10 +10 + 5,5 + 5,5 + 22 = 78 cm
jadikan yg terbaik ya ;)
jumlah keliling total bangun tersebut = 25+10+5,5+ 22+ 5,5 + 10
= 78 (B)