3-5 Parallel Lines and Triangles
DODEA STANDARD
G.1.1: Demonstrate understanding by identifying and giving examples of undefined terms, axioms, theorems, and inductive and deductive reasoning;G.2.2: Use the triangle angle sum theorem and/or the Pythagorean Theorem and its converse, to solve simple triangle problems and justify results;
G.6.4: Prove and use theorems involving the properties of parallel lines cut by a transversal, similarity, congruence, triangles, quadrilaterals, and circles;
OBJECTIVE
To use parallel lines to prove a theorem about triangles
To find measures of angles of triangles
G.1.1: Demonstrate understanding by identifying and giving examples of undefined terms, axioms, theorems, and inductive and deductive reasoning;G.2.2: Use the triangle angle sum theorem and/or the Pythagorean Theorem and its converse, to solve simple triangle problems and justify results;
G.6.4: Prove and use theorems involving the properties of parallel lines cut by a transversal, similarity, congruence, triangles, quadrilaterals, and circles;
OBJECTIVE
To use parallel lines to prove a theorem about triangles
To find measures of angles of triangles
TEXT INFORMATION
VIDEO LESSON
NOTES & IN-CLASS WORK
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SUPPLEMENTAL VIDEO SOURCES
Flippedmath.com - MyGeometry
Section 3.4 Parallel Lines and Triangles
Teacher: Cory Sullivan, Kaiserslautern HS, Germany |
Khanacademy.org
Proof - Sum of Measures of Angles in a Triangle are 180
Triangle Angle Example 1
Teacher: Salman Khan
Proof - Sum of Measures of Angles in a Triangle are 180
Triangle Angle Example 1
Teacher: Salman Khan
EXTRA PRACTICE
Textbook
Pages 175 - 177, #9 - 14, 17 - 21, 29, 30, 33 |
Khan Academy modules
Angles 1 |