After a thorough research, there exists the same question with the following choices and the image link: https://static.k12.com/calms_media/media/1560500_1561000/1560892/1/97202a8cba8d842585e08726b9a1a3262....
A. The sum of m∠1, m∠2, and m∠3 is 90°. <span>B. m∠1 + m∠2 + m∠3 = 180° </span> <span>C. Angle 1 and angle 3 form a straight angle </span> D Angle 1, angle 2, and angle 3 all have the same measure.
The correct answer is letter B. m∠1 + m∠2 + m∠3 = 180°<span> . The sum of interior angles of a triangle is 180 degrees.</span>
