Each of the 3 lines crosses the other 2 lines as shown  below. Which of the following relationships, involving angle measures (in degrees) must be true?

I. m ∠ 2 + m ∠ 7 + m ∠ 12 = 180^◦
II. m ∠ 4 + m ∠ 5 + m ∠ 10 = 180^◦
III. m ∠ 3 + m ∠ 8 + m ∠ 11 = 180^◦
A. I only
B. II only
C. III only
D. I and II only
E. I, II, and III

Transcribed Image Text:

4 1 3 لیا 2 8 5 7 6 12 9 11 10 b C