Academic Standard

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 angle-angle 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.
Initiative: 
Common Core State Standards
Framework: 
Mathematics
Type: 
Standard
Code: 
CCSS.Math.Content.8.G.A.5
Grade range: 
8
 
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Academic Lesson
 
Mathematics
Grades 7 - 8
 
Mathematics
Grades 4 - 8
 
Mathematics
Grades 8 - 11
Academic Web Link
 
Mathematics
Grades 7 - 8
 
Multiple content areas
Grades 6 - 8
 
Mathematics
Grades 7 - 8
 
Multiple content areas
Grades 6 - 8
 
Mathematics
Grades 6 - 8
Academic Unit
 
Mathematics
Grade 8