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Corresponding angles
2 góc đồng vị
Alternate angles
2 góc so le trong
co-interior angles
2 góc trong cùng phía
angles on a straight line add to 180
<' on line add to 180
vertically opposite angles are equal
vert opp <‘s =
angle at point add to 360
<‘s at pt add to 360
angles in triangle add to 180
< sum of triangle is 180
the exterior angle of a triangle is the sum of two interior opposite angles
ext < of triangle = sum of int opp <‘s