4th Grade Math 10.5, Line Symmetry & Line of Symmetry

A shape has line symmetry if it can be folded on a line so that it's two parts match exactly. The line we used to fold the shape is the line of symmetry. It divides a shape into two parts that are the same size and shape. We can use tissue paper, or construction paper to find if a shape has line symmetry. We can have a vertical, horizontal, or diagonal line of symmetry. A diagonal line of symmetry goes through a vertex. Symmetry means having an exact match in size, shape, and arrangement of parts on opposite sides of a line. Some shapes have one line of symmetry, some shapes have more than one. A regular polygon is a polygon in which all sides are the same length, and all angles are the same measure. For regular polygons, the number of sides it has is the number of lines of symmetry it has. We see which capital letters of the alphabet have line symmetry. We see if a green line appears to be a line of symmetry. We can think of a line of symmetry as a mirror making a reflection. We complete a figure by reflecting it over a line of symmetry.
4th Grade Math 10.1, Lines, Rays, and Angles
• 4th Grade Math 10.1, L...
4th Grade Math 10.2, Classify Triangles by Angles
• 4th Grade Math 10.2, C...
4th Grade Math 10.3, Parallel Lines & Perpendicular Lines
• 4th Grade Math 10.3, P...
4th Grade Math 10.4, Classify Quadrilaterals
• 4th Grade Math 10.4, C...
4th Grade Math Playlist
• 4th Grade Math Course
I'm using the Houghton Mifflin Go Math!
2015 copyright textbook for this playlist.
You can practice online using the textbook's website
www.gomathacad...
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