# data[].attributes.headline
When two PARALLEL LINES are cut by a TRANSVERSAL, 8 angles are created.

# data[].attributes.subject
When two PARALLEL LINES are cut by a TRANSVERSAL, 8 angles are created.

# data[].attributes.headline
4 of the angles are ACUTE and the other 4 are OBTUSE.

# data[].attributes.subject
4 of the angles are ACUTE and the other 4 are OBTUSE.

# data[].attributes.body
Would you agree that...
Angle 1, 3, 5 and 7 are ACUTE
Angle 2, 4, 6 and 8 are OBTUSE

# data[].attributes.body
All of the PURPLE RED angles are ACUTE!

All of the GREEN angles are OBTUSE!

# data[].attributes.headline
Also, the angle pairs on this diagram will either be...

# data[].attributes.subject
Also, the angle pairs on this diagram will either be...

# data[].attributes.body
1.  CONGRUENT (the same)
2.  SUPPLEMENTARY  (=180)

# data[].attributes.headline
How can we tell if the angles are CONGRUENT or SUPPLEMENTARY?

# data[].attributes.subject
How can we tell if the angles are CONGRUENT or SUPPLEMENTARY?

# data[].attributes.body
CONGRUENT:  (Part = Part)
Acute = Acute
Obtuse = Obtuse

SUPP:  (Part + Part = 180)
Acute + Obtuse = 180

# data[].attributes.headline
Click on the Activity below to practice classifying angles as CONGRUENT or SUPPLEMENTARY.

# data[].attributes.subject
Click on the Activity below to practice classifying angles as CONGRUENT or SUPPLEMENTARY.

# data[].attributes.body
IS YOUR HEAD SPINNING??!!

# data[].attributes.body
ACUTE = ACUTE
OBTUSE = OBTUSE
ACUTE + OBTUSE = 180