# ALEX Lesson Plan

## Angles, Angles, and More Angles

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This lesson provided by:
 Author: Morgan Boyd Organization: Retirement
General Lesson Information
 Lesson Plan ID: 35590 Title: Angles, Angles, and More Angles Overview/Annotation: This lesson is designed to develop knowledge about the angles of a triangle. This lesson will prove that the interior angles of a triangle will have a sum of 180 degrees. This lesson will prove that an exterior angle is the sum of the remote interior angles. This lesson will show the relationships of the angles of parallel lines and transversals.This lesson results from the ALEX Resource Gap Project.
Associated Standards and Objectives
Content Standard(s):
 Mathematics MA2015 (2016) Grade: 8 20 ) 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. [8-G5] Example: Arrange three copies of the same triangle so that the sum of the three angles appears to form a line, and give argument in terms of transversals why this is so. NAEP Framework NAEP Statement:: 8G3c: Represent problem situations with simple geometric models to solve mathematical or real-world problems. Alabama Alternate Achievement Standards AAS Standard: M.AAS.8.20- Compare any angle to a right angle using greater than, less than, or congruent to the right angle.

Local/National Standards:

Primary Learning Objective(s):

The student will be able to explain the sum of the angles in a triangle equals 180 degrees.

The student will be able to calculate the measure of an exterior angle of a triangle.

The student will be able to calculate the measure of an interior angle when given the exterior and remote interior angle.