Javier constructed a square by drawing two congruent triangles. Which shows one of the triangles he could have used?
A
A triangle with angles 45 degrees, 45 degrees, and 90 degrees. 2 sides are congruent.
B
A triangle with angles 55 degrees, 35 degrees, and 90 degrees.
C
A triangle with angles 65 degrees, 65 degrees, and blank.
D
A triangle with 3 angles of 60 degrees. All sides are congruent.