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ORC Resource Number #4260
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Building with Triangles: What's Important About Triangles?
Best Practice
PROFESSIONAL COMMENTARY

In this third of four lessons related to triangles, students use strips of paper divided into three segments of various lengths to see which strips can form triangles. The goal is for students to discover the triangle inequality, namely, that the sum of the lengths of any two sides must exceed the length of the other side. An activity sheet and problem extensions are included. This lesson is adapted from an article that appeared in the November 1993 issue of Arithmetic Teacher. (sw)

OHIO STANDARDS
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Mathematics Academic Content Standards
Geometry and Spatial Sense Standard
Patterns, Functions and Algebra Standard
NATIONAL STANDARDS
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Principles and Standards for School Mathematics
Algebra Standard
Geometry Standard
RESOURCE TYPE
Instructional Resource
PRACTICE LEVEL
Best Practice
STANDARDS ALIGNMENT
Grades 5–8
TOPICS
Mathematics --
Algebra;
Patterns, sequences;
Geometry;
Plane figures;
KEYWORDS
triangle inequality
Publisher: National Council of Teachers of Mathematics
Author: Marea W. Channel