Math Problem Statement

Use the sketch tool to rotate segment CD 180° around point E.

Solution

To solve this, we need to rotate the line segment CDCD by 180 degrees around point EE.

Rotation by 180 degrees:

  • When we rotate a point or a segment 180° around another point, the result is that each point on the segment ends up directly opposite to its starting position, at the same distance from the center of rotation.
  • Essentially, if we reflect each point through the center of rotation, we get the rotated figure.

Steps for rotating segment CDCD:

  1. Identify Coordinates: Suppose the coordinates of CC, DD, and EE are known (or assume they can be plotted). The midpoint MM of segment CDCD is not relevant for this rotation but indicates the center of the segment.
  2. Rotate Points:
    • Rotate point CC around EE by 180°.
    • Rotate point DD around EE by 180°.
    • The new positions of CC and DD will be directly opposite their current positions relative to point EE, forming a new segment.

Since this is a purely geometric operation (180° rotation results in a straight line opposite), the rotated segment CDCD would flip entirely over point EE.

Would you like more details or a step-by-step drawing approach?

Here are 5 related questions:

  1. How would the image change if we rotated by 90° instead of 180°?
  2. What are the general rules for rotating a point around another point?
  3. How do you calculate the new coordinates of a point after rotation?
  4. What happens to the distance between points during a 180° rotation?
  5. How do you define the direction of rotation (clockwise vs. counterclockwise)?

Tip: For 180° rotations, the new coordinates of any point (x,y)(x, y) become (x,y)(-x, -y) relative to the center of rotation.

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Math Problem Analysis

Mathematical Concepts

Geometry
Rotation
Line Segment

Formulas

Rotation formula: new coordinates after 180° rotation (x', y') = (-x, -y) relative to the center of rotation

Theorems

Rotation theorem
Symmetry theorem

Suitable Grade Level

Grades 8-10