# data[].attributes.headline
Vertical Angle (2 lines cross making angles)

# data[].attributes.subject
Vertical Angle (2 lines cross making angles)

# data[].attributes.headline
Straight Angle ( straight line, 180 degrees)

# data[].attributes.subject
Straight Angle ( straight line, 180 degrees)

# data[].attributes.headline
Segment Bisector(line intersecting an angle, usually in the middle)

# data[].attributes.subject
Segment Bisector(line intersecting an angle, usually in the middle)

# data[].attributes.headline
Postulate 1-3 (2 lines cross on one line)

# data[].attributes.subject
Postulate 1-3 (2 lines cross on one line)

# data[].attributes.headline
Postulate 1-2 (2 lines that cross at a point)

# data[].attributes.subject
Postulate 1-2 (2 lines that cross at a point)

# data[].attributes.headline
Obtuse Angle(angle larger than 90 degrees)

# data[].attributes.subject
Obtuse Angle(angle larger than 90 degrees)

# data[].attributes.headline
Collinear Points( points that lie on the same line)

# data[].attributes.subject
Collinear Points( points that lie on the same line)

# data[].attributes.headline
Congruent angle(angles of a object are the same/equal)

# data[].attributes.subject
Congruent angle(angles of a object are the same/equal)

# data[].attributes.headline
Adjacent Angle(2 sides share a point and side)

# data[].attributes.subject
Adjacent Angle(2 sides share a point and side)

# data[].attributes.headline
Complementary Angle(2 angles that equal 90 degrees)

# data[].attributes.subject
Complementary Angle(2 angles that equal 90 degrees)

# data[].attributes.headline
Square(quadrilateral- shape with 4 sides)

# data[].attributes.subject
Square(quadrilateral- shape with 4 sides)