Unit 1, Lesson 2
Naming the Moves
Grade 8
2.1
Warm-up
Notice and Wonder: A Pair of Quadrilaterals
What do you notice? What do you wonder?
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What do you notice? What do you wonder?
Here is a set of dance moves.
Describe each move and say if it is a new type of move.
How would you describe the new move?
Here are the moves we have learned about so far:
The word clockwise means to turn in the same direction as the hands of a clock. The top turns to the right.
This diagram shows that Figure A turns clockwise to make Figure B.
The term counterclockwise means to turn opposite of the way the hands of a clock turn. The top turns to the left.
This diagram shows that Figure A turns counterclockwise to make Figure B.
A reflection is a transformation that “flips” a figure over a line. Every point on the figure moves to a point directly on the opposite side of the line. The new points are the same distance from the line as they are in the original figure.
This diagram shows a reflection of A over line
A rotation is a transformation that “turns” a figure. Every point on the figure moves around a center by a given angle in a specific direction.
This diagram shows Triangle A rotated around center
A translation is a transformation that “slides” a figure along a straight line. Every point on the figure moves a given distance in a given direction.
This diagram shows a translation of Figure A to Figure B using the direction and distance given by the arrow.