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
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