Math--Chapter 19

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:


Some good practice websites: