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6.5You will find unknown side lengths of similar figures.

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Finding unknown lengths in similar figures

In similar polygons , the lengths of the corresponding sides form equivalent ratios.

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Identify Corresponding Sides

Write and solve a proportion

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Videos to watch

http://www.phschool.com/atschool/academy123/english/academy123_content/wl-book-demo/ph-830s.html

You can open by right clicking and then selecting open hyperlink.

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THE NEXT FOUR SLIDES ARE FOLLOWED BY A VIDEO IN WHICH YOU ARE TO COPY THE TRIANGLES

INTO YOUR NOTES.

ASA, SSS, ASA, SAS

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ANGLE – SIDE - ANGLETwo angles with the included side

are congruent.

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SIDE – SIDE - SIDEThree sides are congruent

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ANGLE – SIDE - ANGLETwo angles and a non-included

side are congruent.

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SIDE – ANGLE - SIDETwo sides and an included angle

are congruent.

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WATCH THE FOLLOWING VIDEO 2 FROM 1:44 – 2:29

Right click and select open hyperlink.

[Triangle song] http://youtu.be/i-aj-9VIxYoStop the video on each of the AAS, SSS, ASA, SAS and copy the triangles into your notes as given in the video.

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FINDING UNKNOWN LENGTHS WITH A TRIANGLE INSIDE A

TRIANGLE.[Fast forward first video to 12:16; however, if needed

the whole video is a great resource]

http://youtu.be/z2Zk3nh9dVQ

http://youtu.be/1T9dHMU5pkk

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WATCH THE FOLLOWING VIDEO TO FIND THE HEIGHT OF A

BUILDING COMPARED TO ITS SHADOW USING EQUIVALENT

RATIOS

Watch from 0.29 to 2.18

http://www.youtube.com/watch?v=ARFcS65qh9w&feature=share&list=PLkXSl2KFkbTsefGMw3NbTuPDQ8oFkW19k&index=42

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EXTRA VIDEO IF NEEDED

http://www.youtube.com/watch?v=ARFcS65qh9w&feature=share&list=PLkXSl2KFkbTsefGMw3NbTuPDQ8oFkW19k&index=42

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Practice Problems

Pg. 295 - 297 # 5, 6, 9, 10, 12, 20, 21

If a polygon needs to be rotated or flipped it might be beneficial to trace one of the figures so that you are able to align corresponding sides.