Proof: Similar Triangles 2     
line AB line DE
DC = 5
EC = 10
AC = 12
BC = 24
1. 
1. 
DC = 5
BC = 24
AC = 12
line AB line DE
ABC ~ DEC
DC / AC = EC / BC
EC = 10
5 BC = 120
5 / 12 = 10 / BC



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