Download 8.G.A.5. Use informal arguments to establish facts about the angle

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8.G.A.5. Use informal arguments to establish facts about the angle sum and exterior angle of
triangles, about the angles created when parallel lines are cut by a transversal, and the angleangle criterion for similarity of triangles. For example, arrange three copies of the same triangle
so that the sum of the three angles appears to form a line, and give an argument in terms of
transversals why this is so.
PARCC Assessment Limit/Clarification:
This standard is part of the major content cluster assessed on PARCC.
Web Resources:
This link has illustrations that link to tasks to support standard 8.G.5. Simply click on Geometry, 8th grade,
then on the illustrations link.
This link allows students to manipulate a polygon and observe the relationships between the sum of
exterior angles.