6th grade ch. 1 sec. 2 symmetry
TRANSCRIPT
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Ch. 1 Sec. 2
Symmetry
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Radial Symmetry
•1 line of symmetry•halves that are mirror images•front end w/ sense organs•quick movement
Bilateral Symmetry
•many lines of symmetry•no distinct front end •live in water•move slowly
• balanced arrangement of parts
Types of symmetry Types of symmetry
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asymmetry• NO symmetry
sponges
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radial symmetry• many lines of symmetry that all go thru. central point
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animals with radial symmetry
sea urchin
sea starbrittle star
sand dollar
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SEA ANEMONE
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Clownfish hide in the poisonous tentacles of the sea anemone.
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bilateral symmetry• 1 line that divides it into halves that are mirror images
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A shape has bilateral symmetry when one halfA shape has bilateral symmetry when one half
of it is the mirror image of the other halfof it is the mirror image of the other half..
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Animals that have bilateral symmetry
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Symmetry of the Human FaceSymmetry of the Human Face
• No face has perfect mathematical symmetry!
• But plastic surgeons study facial symmetry to help them reconstruct faces.
• It is thought that as a face gets closer to symmetrical more people think it is beautiful.
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Is the Face Really Symmetrical?
Notice that the photos of each child's face is made up of the original photo, 2 left sides and 2 right sides.
right / right left / left original photo
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right/rightright/right left/left left/left original photo original photo
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right/ rightright/ right left/left left/left original photo original photo
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right/ right left/left original photoright/ right left/left original photo
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The Symmetry of Capital Letters
• some have one line of symmetry
• some have two lines of symmetry
• some have no lines of symmetry
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Bilateral Symmetry demonstrations
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Types of Animals
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radial symmetry
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radial symmetry• many lines of symmetry that all go thru. central point
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bilateral symmetry
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no symmetry (asymmetry)
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radial symmetry
•all live in water
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radial symmetry
•do not have distinct front or back ends
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radial symmetry
•most do not move fast
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radial symmetry
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bilateral symmetry
•1 line that divides it into halves that are mirror images
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bilateral symmetry
•distinct front ends (sense organs)
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Mark the line of symmetry
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Activity- Magazine pics