Respuesta :

Answer:

100º

Step-by-step explanation:

Find angle3 which is 80º

All lines are 180º

which means angle3+ angle4 is 180º

180º - 80º

= 100º

goodperson21

Answer: B. 100°

Step-by-step explanation:

Since triangles contain angles that add up to 180°, angles 3 is 80°. Since Straight Angles are 180°, it means that angle 4 is 180-80, which equals 100°.

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