2.4 –symmetry. line of symmetry: a line that folds a shape in half that is a mirror image
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2.4 –Symmetry
Line of Symmetry:
A line that folds a shape in half that is a mirror image
1. For each image below, reflect the shape over the line.
2. Determine if the shapes have line symmetry. If it does, draw in all possible lines of symmetry.
one
none
one
two
Rotational Symmetry:
A degree that turns a shape onto itself
360° # matches
Degree =
3. Determine if the shape has rotational symmetry. If it does, find the degree of rotational symmetry.
90°,180°, 270°, 360°
b.
120°, 240°, 360°
60°,120°, 180°, 240°, 300°, 360°
none
4. Below are the most common geometric shapes you will be learning throughout geometry. Identify if the shapes have reflection symmetry, rotation symmetry, both, or none. If it has reflection symmetry, state how many lines of symmetry it has. If it has rotation symmetry, state the degree of rotation.
6 lines60°,120°, 180°,
240°,300°, 360°
1 line
No rotation
2 lines
180°,
No line
360° No rotation
No line 3 lines
120°, 240°,360°
No rotation
4 lines
90°, 180°,360°270°,
1 line
No rotation
infinite 2 lines
180°,360°infinite
No line 1 line
No rotationNo rotation
No line 1 line
No rotationNo rotation
no line
180°,5 lines
72°, 144°,288°,
216°,360°
360°
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