In a triangle, the total angle is 180 degrees. A straight line is always 180 degrees. With this in mind, the following can be obtained:

These are simultaneous equations.

Answer:
associative
Step-by-step explanation:
u switched parentheses
Answer:
what exactly is it asking the angle like 90 degrees obtuse acute?
Step-by-step explanation:
Answer:
b
Step-by-step explanation: