Let’s be more precise about describing moves of figures in the plane.
The following diagram shows the difference between translations, rotations, and reflections.
We use the word image to describe the new figure created by moving the original figure. If one point on the original figure moves to another point on the new figure, we call them corresponding points.
Quadrilateral A can be rotated into the position of Quadrilateral B.
Estimate the angle of rotation
Here is another set of dance moves.
Your teacher will give you a set of cards. Sort the cards into categories according to the type of move they show. Be prepared to describe each category and why it is different from the others. You can explore the applets below to see the ways the images move.
Drag the red point. Explore how the image changes.
Click on the box to show the transformed image.
Move the yellow points and the red segment to see how the image changes.
Clockwise means to turn in the same direction as the hands of a clock. It is a turn to the right.
When part of an original figure matches up with part of a copy, we call them corresponding parts. These could be points, segments, angles, or distances.
Counterclockwise means to turn opposite of the way the hands of a clock turn. It is a turn to the left.
An image is the result of translations, rotations, and reflections on an object. Every part of the original object moves in the same way to match up with a part of the image.
A reflection across a line moves every point on a figure to a point directly on the opposite side of the line. The new point is the same distance from the line as it was in the original figure.
A rotation moves every point on a figure around a center by a given angle in a specific direction.
A translation moves every point in a figure a given distance in a given direction.
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