Respuesta :

Answer: Here's some proof.

Step-by-step explanation:

AB=BC=CD=DE=EF=FA

so express it in AB+AC+AD+EA+FA in terms of AB.

AB+AC+AD+EA+FA = AB+AB+AB+AB+AB = 5AB

So AB+AC+AD+EA+FA = 5AB

So now express in 4AB:

comparing 4AB and AB+AC+AD+EA+FA, we see that 4AB=5AB

therefore, AB+AC+AD+EA+FA=4AB