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Answering three small questions seriously in the process of junior two mathematics. Thank you.
(1): angle bisector, angle, vertical right angle, etc. Plus men, AED and AFD are the same.

(2): Connect DC database

Perpendicular bisector can prove that DB DC is equal to straight bisector plus vertical DE DF is equal to.

The DBE and DCF of HL card are identical.

(3): let AE be x.

AF=x

CF=AF-AC=x-4

BE=CF=X-4

AB=AE+BF=8

Just list the solutions of the equation.

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