Reflection: Dig In! Day 1 - Section 2: Creating Shapes


I created the template for the triangles (isosceles right triangles whose legs are 3 inches long) on graph paper.  When I made copies of the template, the grid on the graph paper was apparent.  This was a mistake.  When my students started finding area, several of them counted the number of squares, resulting in an area of 288.  This necessitated a brief discussion of what this number, 288, represented (area in terms of square quarter inches) - a discussion that I really didn't want to have at that time.  

Next time I do this lesson - I've got to remember to photocopy on a lighter setting so that the grid does not show up!

  My Template for the Triangles
  My Template for the Triangles
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Dig In! Day 1

Unit 1: Tools of Geometry
Lesson 1 of 7

Objective: This lesson, the first in the course, SWBAT activate prior knowledge about triangles and polygons and engage in group work.

Big Idea: Want to find out how many unique shapes can be created using four congruent isosceles right triangles? Dig in!

  Print Lesson
Math, Geometry, Triangles, hypotenuse, Isosceles triangle, isosceles right triangle, legs, Polygon
  100 minutes
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