Geometry Session 2: Triangles and Quadrilaterals

In this session, you will build triangles and quadrilaterals to explore their properties. Classification is an important part of geometry and other areas of mathematics. By creating and manipulating triangles and quadrilaterals, you will develop a sense of logical classifications and how different figures are related.

Part A:
Different Triangles

Part B:
Linkage-Strip Constructions

Part C:
Building Towers

Homework

For information on required and/or optional materials for this session see Note 1.

In this session, you will learn the following:
•	How to classify triangles according to some of their features
•	A rule that describes when three given lengths will make a triangle and when they will not
•	A rule that describes when four given lengths will make a quadrilateral and when they will not
•	How to use what you've learned about geometry and the properties of figures to help with a construction task


	Throughout the session you will be prompted to view short video segments. In addition to these excerpts, you may choose to watch the full-length video of this session.


	Previously Introduced:		New in This Session:
	altitude perpendicular bisector		acute triangle congruent equilateral triangle isosceles triangle obtuse triangle right triangle scalene triangle side-angle-side (SAS) congruence side-side-side (SSS) congruence similar triangles triangle inequality

Next > Part A: Different Triangles

Session 2: Index | Notes | Solutions | Video