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If a square is cut in half across its diagonal, the formed triangles will have angles of ____

A 45-45-90
If a square is split in two at its diagonal, then its angles will also be bisected. A bisection of a 90 degree angle is 45 degrees. Thus, the formed triangles would have angles of 45, 45, and 90 degrees.
B 30-60-90
C 45-45-45
D 60-60-60