Erica D.

asked • 02/17/17

When 2 lines cross, 2 pairs of vertical angles are formed. What is the sum of all 4 angles?


A.
180°
B.
270°
C.
360°
D.
540°

David W.

tutor
Erica, draw two lines crossing each other and I bet you can figure out your answer!
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02/17/17

Andrew M.

           |
           |
______|_______
           |
           |
           |
 
See how the sum of all 4
angles is a circle... 360 degrees.
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02/17/17

1 Expert Answer

By:

Michael J. answered • 02/17/17

Tutor
5 (5)

Effective High School STEM Tutor & CUNY Math Peer Leader

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Two lines intersecting each other form two pairs of supplementary angles.  Supplementary angles are two angles that add up to 180.
 
1st pair of supplementary angles:  Two angles add to 180 degrees
2nd pair of supplementary angles:  Two angles add to 180 degrees
 
You have a total of 4 angles giving total of 360 degrees.
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