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


ProveIt! by Michael Ferraro <mferraro@balstaff.org>.
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