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AB=20 cm (2bagian)
AC= 1 bagian/2bagian x 20=10 cm
BC= 10v3 cm
dengan sudut 45o dan siku maka perbandingan AC:CD:AD(1,1,v2)
dengan AC=10 cm (1 bagian)
AD= v2 bag/1 x10=10v2 cm
DC=1bag/1bagx10=10 cm
BD=BC-DC=10v3-10=10(1-v3)