Unit 1, Lesson 1

Moving in the Plane

Accelerated 7

1.1

Warm-up

Which three go together? Why do they go together?

1.2

Your teacher will give you three pictures. Each shows a different set of dance moves.

Arrange the three pictures so you and your partner can both see them right way up. Choose who will start the game.
- The starting player mentally chooses A, B, or C and describes the dance to the other player.
- The other player identifies which dance is being talked about: A, B, or C.
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.
With your partner, write a description of the moves in each dance.

Here are two ways for changing the position of a figure in a plane without changing its shape or size:

Sliding or shifting the figure without turning it. Shifting Figure A to the right and up puts it in the position of Figure B.

Turning or rotating the figure around a point. Figure A is rotated around the bottom vertex to create Figure C.

A vertex is a point where 2 or more edges meet. When there is more than 1 vertex, they are called vertices.

The vertices of this polygon are labeled , , , , and .