Question

In the give figure, ABC is a triangle. If angle 1 , angle 2 and angle 3 are the exterior angles, then angle 1 + angle 2 + angle 3 = ?




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Answer 1

Answer:

360°

Step-by-step explanation:

Exterior angles of a polygon add up to 360

Answer 2

Answer:

180°

Step-by-step explanation:

Because the interior angles of a triangle add to 180°, and angles c+d also add to 180°:

1. The interior angles of a triangle add to 180°:a + b + c = 180°
2. Angles c and d make a straight angle, which is 180°:d + c = 180°
3. So d + c equals a + b + c:d + c = a + b + c.
4. Subtract c from both sides:d = a + b.