Answer:
1. Because they are Vertically opposite
2. 2 lines that form a straight line and form 180 degrees when added are called a linear pair.
3. Because angle 1 and 2 is a linear pair and forms 180 degrees. The same goes for angles 2 and 3.
4. Because when they are a linear pair and together they form 180 degrees.
5. Angle 1 and 2, angles 2 and 3 are linear pairs. And linear pairs always form 180 degrees. So, they are both equal.
6. Because they are vertically opposite angles.
7. Because they are vertically opposite angles.
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Answer:
B
Step-by-step explanation:
It is saying the same thing as 18-7 just in the parenthesis (-7).
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