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3rd Grade Math 11.3, Algebra, Find Unknown Side Lengths

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First published at 13:13 UTC on August 9th, 2019.

JoAnn's School

JoAnnsSchool

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We can find the unknown length of a side in a plane shape when we know its perimeter. We add the given side lengths and subtract there sum from the given perimeter. The perimeter of a figure is the distance around all the sides of the figure. When we add the given side lengths, we can use a variable to take the place of the unknown length. We find unknown side lengths for a rectangle, square, regular hexagon, and irregular shaped polygons.

3rd Grade Math 11.1, Model Perimeter
https://youtu.be/CKhTsEBoYbQ

3rd Grade Math 11.2, Find and Measure Perimeter
https://youtu.be/P3OraGny10U

3rd Grade Math Playlist (2015)
https://www.youtube.com/playlist?list=PLKi4WTp6PRGVPton7wjphpYAhdTjnJsw0

I'm using the Houghton Mifflin Go Math!
2015 copyright textbook for this playlist.

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