Answer:
45°
Step-by-step explanation:
Since ABCD is a square, ∠ABC must be 90°, a straight angle. Due to symmetry, ∠ABE and ∠EBC will divide this angle in two equal angles, and 90/2=45.
45 degrees.
The 4 angles in a square are all 90 degrees.
The diagonals bisect these angles, so m < ABE = 1/2 * 90
= 45 degrees.
