As shown in the figure, in △ ABC, ab = AC, be = AE, the perimeter of △ BCE is 12, BC = 5, find the length of ab

The perimeter of ∵ BCE is 12, ∵ BC + CE + be = 12, ∵ BC = 5, be = AE, ∵ 5 + CE + AE = 12, ∵ AC = 7, ∵ AB = AC, ∵ AB = 7

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1. As shown in the figure, ad and AE are the height and middle line of the triangle ABC respectively, and ab = 8, AC = 5. What is the perimeter of the triangle Abe over the triangle ace? What is the relationship between the area of triangle Abe and triangle ace?
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7. As shown in the figure, abad = BCDE = ACAE, verification: △ abd ∽ ace
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