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diketahui sisi 1 = 38 cm sisi 2 = 47 cm fan keliling nya 100 cm, maka
kell = sisi 1 + sisi 2 + sisi 3
100 = 38 + 47 + sisi 3
100 cm= 85 cm + sisi 3
100-85 = sisi 3
15 cm = sisi 3
jadi sisi lainnya = 15 cm:)
maaf klo salah
100-(38+47)=15