Page 28 - 新思维数学学生用书5 样章

2.2 Symmetry

Continued

Is there a diagonal line of symmetry? Place a small mirror

exactly through the

middle of the pattern
along different diagonals.

Does the pattern have one
side that exactly mirrors

the other?

No, the colours are different.

Answer: The pattern has 0 lines of symmetry.

Exercise 2.2

1 How many lines of symmetry does each triangle have?

a b c

d e f

Check with your partner. Do you get the same answers?

Use a mirror to check for lines of symmetry and to find any that you missed.
Write a sentence to say how good you are at finding lines of symmetry in triangles

and how you can improve.

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