The vertex a of the square ABCD is in the shape ∠ EAF = 45 °, e, f is in the shape BC.CD Let EF be ah ⊥ EF in H. prove ah = ab

The vertex a of the square ABCD is in the shape ∠ EAF = 45 °, e, f is in the shape BC.CD Let EF be ah ⊥ EF in H. prove ah = ab

In fact, this problem is to prove similar congruent triangles. Because ∠ BAE = ∠ eah, ∠ EBA = ∠ ahe, ∠ bea = ∠ hea, triangle Abe is similar to triangle ahe. Triangle Abe and triangle ahe have common edge AE, AE = AE, so triangle Abe and triangle ahe are congruent. Ah = ab