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Playlist: Bookmarks

Grouping Shapes by Parallel and Perpendicular Sides

Which shapes go together based on parallel and perpendicular lines?

Same Perimeter, Different Area For Rectangles

Can two rectangles have the same perimeter but… different areas!?

Math Curiosity: Four Squares

Every positive integer can be written as the sum of (at most) four perfect squares!

Math Curiosity: Odds & Squares

Why does the sum of the first 5 odds also equal 5 squared?