Page 25 - 新思维数学活动用书5 样章
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2 2D shape and pattern
4 Predict where the reflection of the triangle will be after it is reflected over each of
the mirror lines. Draw your predictions using a ruler.
mirror line
mirror line
mirror line
mirror line
Check your predictions by placing a mirror along each of the mirror lines in turn.
Look at how the triangle is reflected. Tick the predicted reflections that are correct.
Use a different colour pencil to correct the predictions that are wrong.
Practice
5 Use a ruler to draw all of the lines of symmetry on these triangles.
a b
d
c e
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