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Qingdao banbashang mathematics
∫DE∑AC

∴∠CAD=∠ADE

∫AD average score ∠BAC means ∠CAD=∠DAB.

∴∠ADE=∠DAB

∴AE=DE

Triangle ADB is a right triangle.

∴∠EAD and ∠ABC are complementary, ∠ADE and ∠EDB are complementary.

∴∠EBD=∠EDB

∴BE=DE

∴AE=BE

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