Common Core Aligned Resources for 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 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.
Showing 1 - 30 of 52 resources
Parallel Lines Exploration with TI-nspire
7th - 8th CCSS: Adaptable
Explore angle measurements of two parallel lines cut by a transversal. Learners use TI-nspire graphing calculators to assist in understanding the relationships between the angle measurements. Worksheet is not included, but the diagrams...
Congruence, Proof, and Constructions
8th - 10th CCSS: Designed
This amazingly extensive unit covers a wealth of geometric ground, ranging from constructions to angle properties, triangle theorems, rigid transformations, and fundamentals of formal proofs. Each of the almost-forty lessons is broken...
Performance Based Assessment Practice Test (Grade 8 Math)
8th CCSS: Designed
Full-length practice tests like this one offer a wealth of individualization opportunities, especially when they includes a number of open-response questions. Here the class can really get some hands-on experience wrestling with the...
Understand the Relationship Between Exterior Angles
3 mins 7th - 9th CCSS: Designed
Beginning with a review on angles, the lesson describes how exterior angles are related to interior angles. Watch how the rest of the angles can be determined based on one interior and one exterior angle given. The video finishes with...