Chapter 19: Motion Geometry

Lesson 1: Turns and Symmetry. Objective: To relate angle measures to 1/4, 1/2, 3/4, and complete turns and to identify line and rational symmetry in geometric shapes.

Lesson 2: Congruent and Similar Figures. Objective: To identify congruent and similar figures.

Lesson 3: Problem Solving Strategy: Make a Model. Objective: To use the problem solving strategy *make a model* to solve problems.

Lesson 4: Transformations. Objective: To identify and predict the results of translations, reflections, and rotations.

Lesson 5: Tessellations. Objective: To identify shapes and mixed shapes that tessellate.

Lesson 6: Geometric Patterns. Objective: To identify and extend geometric patterns.

Vocabulary: line symmetry, rotational symmetry, congruent, similar, transformation, translation, reflection, rotation, tessellation, angle, circle, ray

**angle:** a figure formed by two line segments or rays that share the same endpoint

**circle:** a closed figure made up of points the same distance from the center

**ray:** a part of a line; it has one endoint and continues without end in one direction

**line symmetry: **what a figure has if it can be folded about a line and from two parts that match exactly

**rotational symmetry:** what a figure has if it can be turned around a central point and still look the same in at least two positions

**congruent:** having the same size and shape

**similar:** having the same hape but maybe a different size

**transformation: **a movement of a figure by a translation, reflection, or rotation

**translation: **a movement of a figure to a new position along a straight line

**reflection: **a movement of a figure to a new position by flipping it over a line

**rotation: **a movement of a figure to a new position by turning it around a point

**tessellation: **a repeating pattern of closed figures that covers a surface with no gaps or no overlaps

Our textbook website: www.harcourtschool.com

Some good practice websites:

http://www.gamequarium.com/placevalue.html

http://www.softschools.com/math/games/

www.multiplication.com

www.funbrain.com