ALEX Lesson Plan

Lay It on the Line

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This lesson provided by:
 Author: Susan Jordan System: Mobile County School: Mobile County Board Of Education
General Lesson Information
 Lesson Plan ID: 33165 Title: Lay It on the Line Overview/Annotation: This lesson allows students to explore their surroundings to locate and prove the presence of perpendicular lines. Students will use the corner of a ruler as a tester to determine right angles contained in classroom items. It can be included in a unit on geometry and measurement. This is a College- and Career-Ready Standards showcase lesson plan.
Associated Standards and Objectives
Content Standard(s):
 MA2015 (4) 23. Recognize angles as geometric shapes that are formed wherever two rays share a common endpoint, and understand concepts of angle measurement. [4-MD5] a. An angle is measured with reference to a circle with its center at the common endpoint of the rays by considering the fraction of the circular arc between the points where the two rays intersect the circle. An angle that turns through 1/360 of a circle is called a "one-degree angle" and can be used to measure angles. [4-MD5a] b. An angle that turns through n one-degree angles is said to have an angle measure of n degrees. [4-MD5b] MA2015 (4) 26. Draw points, lines, line segments, rays, angles (right, acute, obtuse), and perpendicular and parallel lines. Identify these in two-dimensional figures. [4-G1] MA2015 (4) 27. Classify two-dimensional figures based on the presence or absence of parallel or perpendicular lines or the presence or absence of angles of a specified size. Recognize right triangles as a category, and identify right triangles. [4-G2]

Local/National Standards:

Primary Learning Objective(s):

• Recognize right angles in real-world figures.
• Identify the presence of right angles as part of perpendicular lines.
• Recognize the differences between parallel and perpendicular lines.

Essential Question: Where do I see perpendicular lines in real life and how can I prove it?

Preparation Information
 Total Duration: 31 to 60 Minutes Materials and Resources: Teacher:RulersProtractorsResponse ChartStudent:One index card per studentClassroom Finds handout per studentExit Slip per student Technology Resources Needed: Interactive whiteboard lesson (use attached pages for alternative displays if interactive whiteboard is not available.) Background/Preparation: Students should know about angles and how angles are measured. They should have an understanding of degrees as a unit for measuring angles and that a right angle has a measure of 90 degrees.
Procedures/Activities: