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Geometry – Honors . Unit 1: Transformations Day 5: Dilations. Agenda. Warm-up Homework Check Notes /Activity Independent Practice. Warm-Up. Individually, rewrite your definitions WITHOUT using the vocabulary term. Isometry Translation Reflection Rotation
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Geometry – Honors Unit 1: Transformations Day 5: Dilations
Agenda Warm-up Homework Check Notes/Activity Independent Practice
Warm-Up Individually, rewrite your definitions WITHOUT using the vocabulary term. Isometry Translation Reflection Rotation e.g. Rotation is not “rotating an object”
In partners One at a time: 1 person close your eyes for 15 seconds. The other person, watch their eyes as they open. Write down what you notice. Repeat with other person.
Dilation • A dilation occurs when you resize a shape • It can get bigger or smaller. • but it still looks similar, meaning all angles stay the same and relative sizes are the same • Does a dilation have the property of isometry?
All Dilations have a scale factor Scale Factor– describes size change
What is the difference between an enlargement and a reduction? • The dilation is an enlargement if the scale factor is greater than 1. • The dilation is a reduction if the scale factor is between 0 and 1.
How do you go from A to A’ Does that work for B to B’ and C to C’?
Algebraic Rule for Dilations: *c is called the scale factor
If given a preimage and an image how do you find the scale factor? A’ or A need to be either the x’s or the y’s of one coordinate, Unless the values are zero.
Independent Practice Page 676-678 #7-14, 18-20, 32-35, 38,39, 42
Exit Ticket Come up with an example or a time you would see or use a dilation in the real world.
Homework Dilation Worksheet