Question

Which of the following must be true?

Answer 1

Answer:

B, it's the only plausible one. A is wrong because the value would be above 180°

Answer 2

Answer:

m∠2+m∠8=180°

Step-by-step explanation:

m∠1=m∠4=m∠5=m∠8

m∠2=m∠3m∠6=m∠7

m∠1+m∠2=180°

and m∠2+m∠8=180°