11.1 And 11.2 Notes
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11.1 And 11.2 Notes

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    11.1 And 11.2 Notes 11.1 And 11.2 Notes Presentation Transcript

    • Geometry Warm up: pg. 570 # 18-21
    • 11.1 Similar Polygons pg. 563 -570 RECALL from chapter 4 -- Congruency.. You learned specifically that TRIANGLES are ≅ if they meet certain criteria: SAS SSS ASA AAS (AAA and ASS or ASS backwards did NOT work) What did you have to do? -Compare 2 triangles -See if pieces matched in a specific order -Declare them ≅ -Then the remainign pieces were CPCTC
    • This time we are not concerned about ≅ but we are concerned about similarity! 2 figures are congruent if they are the same exact size and shape 2 figures are similar they are the same shape but their sides are proportional (think Xerox machine)
    • Polygons are similiar IF and ONLY IF their corresponding angles are ≅ AND their sides are proportional!