Answer:
A
C
Step-by-step explanation:
A and C gives same result....
2. Angle Addition Postulate as they are adding both angles
3. 60 + 40 = m <ABC because it's a substitution
4. 100 = m <ABC as it is simplified already
5. Definition of obtuse angle
Answer:
2.07 x 10^4
Step-by-step explanation:

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