# ALEX Lesson Plan

## What you know about the Bermuda Triangle?

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This lesson provided by:
 Author: Tonia Bevelle System: Tuscaloosa City School: Tuscaloosa City Board Of Education
General Lesson Information
 Lesson Plan ID: 33167 Title: What you know about the Bermuda Triangle? Overview/Annotation: The basis of this lesson is for students to form a connection between the importance of geometry as it relates to the Bermuda Triangle.  Students should think about the geographical locations and how they form a particular type of triangle.  Within the triangle exists a relationship between the angles and the length of the sides.  As the students reflect prior concepts and skills should come to mind to help them solve the problem. The ideas presented here can be used as the final lesson in a unit on triangles to summarize all that students have learned. Alternatively, the main problem from this lesson could be used as a final assessment activity for a unit on triangles.This is a College- and Career-Ready Standards showcase lesson plan.
Associated Standards and Objectives
Content Standard(s):
 MA2015 (9-12) Geometry 10. Prove theorems about triangles. Theorems include measures of interior angles of a triangle sum to 180o, base angles of isosceles triangles are congruent, the segment joining midpoints of two sides of a triangle is parallel to the third side and half the length, and the medians of a triangle meet at a point. [G-CO10] MA2015 (9-12) Geometry 33. Use coordinates to compute perimeters of polygons and areas of triangles and rectangles, e.g., using the distance formula.* [G-GPE7]

Local/National Standards:

• Standard 1: Make sense of problems and persevere in solving them
• Standard 2: Reason abstractly and quantitatively
• Standard 3: Construct viable arguments and critique the reasoning of others
• Standard 4: Model with mathematics
• Standard 5: Use appropriate tools strategically
• Standard 6: Attend to precision
• Standard 7: Look for and make use of structure
• Standard 8: Look for and express regularity in repeated reasoning

Primary Learning Objective(s):

Students will:

• Identify points in the plane that, when connected to the endpoints of a given segment, form a specific type of triangle
• Classify triangles according to sides (scalene, isosceles, equilateral)
• Classify triangles according to angles (right, acute, obtuse)

1. The students can then locate the three vertices of the Bermuda Triangle. (Miami, Puerto Rico, and Bermuda)
2. Using a coordinate plane with the x and y axis, the students create points for each geographical location and find the distance between the three vertices of the triangle.
3. This will help with defining the perimeter of the triangle.
Preparation Information
 Total Duration: 31 to 60 Minutes Materials and Resources: 1. Rulers2. Pencil and Paper3. Reference materials (i.e. books, Internet) about the Bermuda Triangle4. Protractor Technology Resources Needed: Computer and Internet Connection Background/Preparation: Prior to teaching this lesson, the teacher should view the videos. Print one copy of the worksheet and the answer key.  Make sure you get all necessary materials and have them at each station.
Procedures/Activities: