1.1: Which One Doesn’t Belong: Diagrams
Which one doesn’t belong?
- Sliding or shifting the figure without turning it. Shifting Figure A to the right and up puts it in the position of Figure B.
Lesson 1: Moving in the Plane
Let’s describe ways figures can move in the plane.
1.2: Triangle Square Dance
Your teacher will give you three pictures. Each shows a different set of dance moves.
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Arrange the three pictures so one of you can see them right way up. Choose who will start the game.
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The starting player chooses one of the three applets below and describes the dance to the other player.
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The other player identifies which dance is being talked about: A, B, or C.
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After one round, trade roles. When you have described all three dances, come to an agreement on the words you use to describe the moves in each dance.
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With your partner, write a description of the moves in each dance.
Dance A:
Dance B:
Dance C:
We could think of each dance as a new dance by running it in reverse, starting in the 6th frame and working backwards to the first.
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Pick a dance and describe in words one of these reversed dances.
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How do the directions for running your dance in the forward direction and the reverse direction compare?
Summary
Here are two ways for changing the position of a figure in a plane without changing its shape or size:
- Turning or rotating the figure around a point. Figure A is rotated around the bottom vertex to create Figure C.
