Geometry
Learning Goals
Grade 3
Geometric Properties

Grade 4
Geometric Properties

Grade 3
Chapter 7: 2D Geometry Click on a lesson: Lesson 1: Exploring Tangrams Lesson 2: Describing Congruent Shapes Lesson 3: Symmetry Lesson 4: Communicate About Symmetry Lesson 5: Sorting 2D shapes Lesson 6: Geometry Patterns 
Grade 4
Chapter 7: 2D Geometry Click on a lesson: Lesson 1: Classifying Quadrilaterals Lesson 2: Building Quadrilaterals Lesson 3: Congruent Shapes Lesson 4: Similar Shapes Lesson 5: Measuring Angles Lesson 6: Solve Problems by Acting Them Out Lesson 7: Lines of Symmetry Lesson 8: Classifying 2D Shapes 
The Greedy Triangle
.A bored triangle is turned into a quadrilateral after a visit to the shapeshifter. Delighted with his new career opportunities (as a TV screen and a picture frame) he decides the more angles the better, until an accident teaches him a lesson.
Polygons
A polygon is a closed figure with straight sides.


A triangle is a polygon with 3 sides and 3 angles.

A quadrilateral is a polygon with 4 sides and 4 angles.
