Angle relationships
8.G.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.
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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.
Khan Academy
Learn Zillion
- Find the measurements of corresponding angles
- Find the side length of a triangle using angle-angle criterion
- Find the measurement of an exterior angle
- Find the measurements of vertical and adjacent angles
- Find the measurements of alternate interior and alternate exterior angles
- Find the measure of an angle in a triangle using the other two angles
Q.1 Identify complementary, supplementary, vertical, adjacent, and congruent angles
Q.2 Find measures of complementary, supplementary, vertical, and adjacent angles Q.3 Transversal of parallel lines Q.6 Find missing angles in triangles and quadrilaterals Q.8 Interior angles of polygons Q.13 Congruent triangles: SSS, SAS, and ASA |