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Camille loves guessing games. She will tell you a fact about her shape to see if you can guess what it is. (Refer to the Math Notes box in this lesson if you need help with the vocabulary.)

  1. “My triangle has only one line of symmetry. What is it?”

  2. “My triangle has three lines of symmetry. What is it?”

  3. “My quadrilateral has no lines of symmetry, but it does have 180º rotation symmetry. What is it?”

Think of different types of triangles.

An example of an equilateral, obtuse, acute and Isosceles triangle

Find the number of lines of symmetry for each type of triangle.

The equilateral triangle has 3 lines of symmetry and the Isosceles triangle has 1 line of symmetry.