Monday - 3.1.1 What Do These Shapes Have in Common?
Review Chapter 2 Test
Introduction to Chapter 3
Dilations: Shape, Size and Similarity
CW: 3-2 and 3-3
HW: 3-5 thru 3-9
Dilation Notes:
Tuesday
CW: 3-10 thru 3-15
If polygons are similar, their side lengths are in proportion, and we can write ratios to show this.
They have a common multiple - i.e., if all side lengths have been doubled, the "zoom factor"/scale factor is 2.
HW: 3-17 thru 3-20
Wednesday
Warm-Up: 3-15, 3-22 and 3-23
Classwork: 3-24, 25, 26
Homework: 3-27 and 28
Thursday
CW: 3-32,33,34,35
HW: 3-38 and 3-39 and Study for Quiz
Quiz Topics
- A DILATION is the type of transformation that produces a similar figure - either by making it smaller (scale factor between zero and one) or by making it bigger (scale factor bigger than one).
- Know that similar means SAME SHAPE but DIFFERENT SIZE.
- Know how to find zoom factor/scale factor: Take a pair of corresponding sides and write them as a fraction, new divided by old.
- The scale factor is the number that all sides are MULTIPLIED by to come up with new sides.
- DOUBLE CHECK your scale factor - if a scale factor is BIGGER than one, it means the shape got BIGGER. If the shape got SMALLER, your scale factor should be between zero and one (a fraction like one-half).
- Know how to use proportions to find missing side lengths in similar figures.
- Knowing that if two angles in a triangle are congruent to two angles in another triangle, then the third angles must also be congruent.
- Know how to LABEL similar figures and know how to USE the label (i.e. triangle ABC ~ triangle XYZ) to help you know which sides are CORRESPONDING SIDES.
- Decide if similar triangles are correctly or incorrectly labelled as similar.
Friday
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