![]() Ask if students can determine what is written. Remind students that they have to write from right to left (rather than left to right as we usually write). Ask students to practice mirror writing their name and have them check their writing with a mirror. The line that divides the object or the figure into two equal halves or congruent halves is called the line of symmetry or the Mirror Line. Aligns with CCSS 4.G.A.3 - Recognize a line of symmetry for a twodimensional figure as a line across the figure such that the figure can be folded along. Click on > to move to the next worksheet. A series of worksheets for students to indicate the line of reflection symmetry on a image. Use a mirror to determine what is written. Topic: Geometry, Straight Lines, Reflection, Symmetry. Then explain mirror writing to the class. It is characterized as reflection symmetry if, at most, one line splits an image into two halves, with one half being the mirror reflection of the other. Ask students to stand for symmetrical shapes and sit for asymmetrical shapes. Then show students more shapes and ask students to determine which shapes are symmetrical. Line of Symmetry A line of symmetry or axis of symmetry is a line that splits a figure into two identical halves (mirror images). This line of reflection is called a line of symmetry. Show that doing so does not make the shape symmetrical, but shows different results. Line symmetry is usually named by the line where you would put a mirror, showing how the two sides of the shape are reflections of each other. A shape has reflection symmetry if there is a line through the centre of the shape that you can reflect across without the shape appearing to move at all. Remind students that you could place the mirror on the line in two ways, to reflect the left or right side of the heart. The whole heart is symmetrical, but when students try placing the mirror on the dotted line of the broken heart, they should see that it is asymmetrical- or does not have symmetry. In 2-dimensional geometry, a glide reflection (or transflection) is a symmetry operation that consists of a reflection over a line and then translation along that line, combined into a single operation. ![]() Ask students to place the mirror on the dotted line and to determine if the shape has symmetry or not. ![]() This line is a symmetry line for the figure. Hand out a worksheet with a heart and a broken heart as well as a mirror. A plane figure is reflection-symmetric if and only if there is a line which reflects the figure onto itself. If you don't have a mirror you could also fold it in half to determine if a shape has symmetry. Explain to students that a shape has symmetry if the image remains the same if you place a mirror in the middle of the object.
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