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Published byHerman Lesmono Modified over 5 years ago
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11.7 Dilations/Rotation Objective: Students will be able to explain if a figure’s dilation will be an increase or decrease based on the scale factor. They will also be able to use the scale factor to draw a dilation given a scale factor.
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Notes Dilation: transformation that enlarges or reduces a figure by a scale factor. Scale factor (k): increases / decreases figure. Size and shape increase/decreases. Area and perimeter affected
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Notes Enlargement Reduction Increase in size Scale is higher than 1
Decrease in size Scale less than 1
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Scale the figure and give new vertices
Vertices A(-2,4) B(4,4) C(2,-2). Scale of ½.
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Rotation Notes Rotation: figures rotates around a “center of rotation”
Called a “turn” Same size and shape.
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Scale the figure and give new vertices
Vertices: A(1,2) B(0,0) C (2,-1). Scale of 2.
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Scale the figure and give new vertices
Vertices A(0,0) B(2,4) C(6,-4). Scale of ½ .
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Vertices: A(-1,1) B(2,2) C (2,-2). Scale of 3.
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Find the vertices and then graph
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Find the vertices and then graph
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Tell me if the graph is a translation/reflection/dilation or rotation.
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Tell me if the graph is a translation/reflection/dilation or rotation.
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Activity 1. Graph points and label Use scale and write new coordinates after dilation Create new graph and label new points Tell me if it’s an enlargement or reduction.
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Wrap up Questions/Comments Ic: activity Hw: finish
Objective: Students will be able to explain if a figure’s dilation will be an increase or decrease based on the scale factor. They will also be able to use the scale factor to draw a dilation given a scale factor.
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Describe the transformations
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