# data[].attributes.headline
Supplementary angles add up to 180 degrees

# data[].attributes.subject
Supplementary angles add up to 180 degrees

# data[].attributes.headline
angles on a straight line add up to 180 degrees

# data[].attributes.subject
angles on a straight line add up to 180 degrees

# data[].attributes.headline
Co-interior angles between parallel lines add up to 180 degrees

# data[].attributes.subject
Co-interior angles between parallel lines add up to 180 degrees

# data[].attributes.headline
interior angles in a regular polygon are all equal

# data[].attributes.subject
interior angles in a regular polygon are all equal

# data[].attributes.headline
corresponding angles, co-interior angles, alternate angles :))))

# data[].attributes.subject
corresponding angles, co-interior angles, alternate angles :))))

# data[].attributes.headline
interior angle of an equilateral triangle are 60 degrees (180/3)

# data[].attributes.subject
interior angle of an equilateral triangle are 60 degrees (180/3)

# data[].attributes.headline
Exterior angles of all polygons add up to 360 degrees

# data[].attributes.subject
Exterior angles of all polygons add up to 360 degrees

# data[].attributes.headline
Angles in a triangle add up to 180 degrees

# data[].attributes.subject
Angles in a triangle add up to 180 degrees

# data[].attributes.headline
adjacent angles on a straight line add up to 180

# data[].attributes.subject
adjacent angles on a straight line add up to 180

# data[].attributes.body
Vertex

# data[].attributes.body
parallel lines

# data[].attributes.body
Angles