Jawabanmu

2014-05-29T20:30:07+07:00
65 = 2x-5+2x-5+x
65=5x-10
75=5x
75/5=x
15 cm = x

panjang BC=2x-5
                 =2.15-5
                 =30-5 = 25 cm
Jawaban paling cerdas!
2014-05-29T20:30:12+07:00
K = 3s
65 cm = x  + 2x - 5 + 2x -5
65 cm = 5x - 10
65 cm + 10 cm = 5x
75 cm = 5x
x = 75 cm : 5
x = 15 cm
BC = 2x - 5 cm
      = 2.15 cm - 5 cm
      = 30 cm - 5 cm = 25 cm (B)
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