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angles in an equilateral triangle
are equal 60

corresponding angles on parallel lines

vertically opposite angle
vertically opposite angle

base of an isosceles triangle are equal
isosceles

alternate angles on parallel lines

exterior angles of a triangle
exterior angles of a triangle

angles on the same arc are equal

base angle from circle radii are equal

sum of angles on a straight line = 180
180

sum of interior angles of a triangle = 180
180

sum of co-interior angles on parallel lines = 180
180

sum of angle at a point = 180
180


sum of exterior angles of a polygon = 360