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Answer:
B. 100°
Step-by-step explanation:
Angles 1 and 5 are corresponding angles and congruent.
Angles 5 and 7 are a linear pair and supplementary angles, so their measures add to 180°.
m<5 + m<7 = 180°
m<5 + 80° = 180°
m<5 = 100°
m>1 = m<5
m<1 = 100°
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Rewritten by : Barada
Both lines are parallel so using the bottom line you are given angle 7 as being 80 degrees. Angle 5 and 7 form a straight line which is 180 degrees so angle 5 would be 180-80 = 100 degrees.
Angle 1 is the same as angle 5 so angle 1 is 100 degrees.
Answer: 100 degrees
