2Line SymmetryA shape has line symmetry when one half of it is the mirror image of the other half.Symmetry exists all around us and many people see it as being a thing of beauty.
3To be a line of symmetry, the shape must have two halves that match exactly. When you trace a heart onto a piece of folded paper,and then cut it out, the two half hearts make a whole heart.The two halves are symmetrical.
4Which of these flags have a line of symmetry? United States of AmericaNOCanadaYES
5What about these math symbols? Do they have symmetry?+-YesYes-xYesYes
6Line Symmetry exists in nature but you may not have noticed.
7At the beach, there are a variety of shells with line symmetry.
8Under the sea there are also many symmetrical objects such as these crabs and this starfish. This type of symmetry is also called reflectional symmetry as the two parts reflect/match along each side of a dividing line ( or axis ).
9Animals that have Line Symmetry Here are a few more great examples of mirror image in the animal kingdom.
10REFLECTION IN WATERIf an object is reflected in water, it is considered to have line symmetry along the waterline.
11The Taj MahalSymmetry exists in architecture all around the world. The best known example of this is the Taj Mahal.
12This photograph shows 2 lines of symmetry This photograph shows 2 lines of symmetry. One vertical, the other along the waterline.(Notice how the prayer towers, called minarets, are reflected in the water and side to side).
13Shapes and SymmetryDo equilateral triangles have lines of symmetry? How many? Investigate by folding and make a conjecture!
14An equilateral triangle has 3 lines of symmetry.
15Shapes and SymmetryDo squares have lines of symmetry? How many? Investigate by folding and make a conjecture!