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Verified answer
Keliling segitiga = jumlah sisi-sisi segitigax+(x+2)+(2x+1)=43
4x+3=43
4x=40
x=10
x + x+ 2 cm+ 2x + 1cm = 43 cm
4x = 43 cm - 3 cm
x = 40/4 cm = 10 cm <- jawaban