As shown in the figure, a // b, put the right-angled vertex of a triangular plate on the straight line a, angle 1 = 42.0, then the degree of angle 2 is ()
Choices:
A:46°
B:48°
C:56°
D:72°
Please directly answer the question and provide the correct option letter, e.g., A, B, C, D.
Question: As shown in the figure, a // b, put the right-angled vertex of a triangular plate on the straight line a, angle 1 = 42.0, then the degree of angle 2 is ()
Choices:
A:46°
B:48°
C:56°
D:72°
Please first conduct reasoning, and then answer the question and provide the correct option letter, e.g., A, B, C, D, at the end.
Question: As shown in the figure, a // b, put the right-angled vertex of a triangular plate on the straight line a, angle 1 = 42.0, then the degree of angle 2 is ()
Choices:
A:46°
B:48°
C:56°
D:72°