Geometry Chapter 4: Congruent Triangles 4.8-β Perform Congruence Transformations SWBAT: create an image congruent to a given triangle. Common Core: G.CO.6, G.CO.7, G.CO.8, G.CO.9, G.CO.10, G.CO.12, G.SRT.5 A _________________________________ is an operation that moves or changes a geometric figure in some way to produce a new figure. The new figure is called the ________________________________. A transformation can be shown using an arrow. There are three main types of transformations. 1. A ____________________________ moves every point in the figure the same distance in the same direction. 2. A ____________________________ uses the line of reflection to create a mirror image of the original figure. 3. A ____________________________ turns a figure about a fixed point, called the center of rotation. Example 1: Identify the transformations. Name the type of transformation demonstrated in each picture. Geometry Chapter 4: Congruent Triangles A ______________________________________________ changes the position of the figure without changing its size or shape. Example 2: Translate a figure in the coordinate plane Figure ABCD has the vertices π΄(β4, 3), π΅(β2, 4), πΆ(β1, 1), πππ π·(β3, 1). Sketch ABCD and its image after the translation π₯, π¦ β (π₯ + 5, π¦ β 2). (π₯, π¦) (π₯ + 5, π¦ β 2) π΄(β4, 3) π΅(β2, 4) πΆ(β1, 1) π·(β3, 1) Geometry Chapter 4: Congruent Triangles Example 3: Reflect a figure in the x-βaxis You are drawing a pattern for a cross stitch design. Use a refelction in the x-βaxis to draw the half of the pattern. Step 1: Multiply the __________________ by β1. (π₯, π¦) (β1, 0) (1, 1) (2, 4) (3, 1) (7, 0) Geometry Chapter 4: Congruent Triangles Practice: Name the type of transformation shown. Geometry Chapter 4: Congruent Triangles Example 4: Identify a rotation Geometry Chapter 4: Congruent Triangles Example 5: Verify congruence Homework: 4.9 Practice B

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