∫△EBD is folded by △CEB, ∴△CBE and △EBD are congruent, ∴ △ CBE = ∠ EBD.
∴∠A=∠ABE=∠CBE. European Development Bank
∫△AED and△△△ EDB are identical.
△CBE and△△ EBD are congruent.
So three triangles are congruent.
AD=BD=CB
∴CB= half AB
∫∠C = 90。
∴∠ A = 30 degrees (the opposite side of the 30-degree angle is equal to half of the hypotenuse)
∴∠A=∠ABE=∠CBE=30
Do you understand, smart guy?