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Recognize quarter turns

A quarter turn is a rotation through one of four equal parts of a full turn, changing direction by a right angle (90°); it may be clockwise or anticlockwise and can be identified from an object’s starting and ending orientations. This understanding distinguishes a quarter turn from a half, three-quarter, or full turn, without extending to measuring arbitrary angles or applying rotations in a coordinate system.

Detailed Explanation: Recognize quarter turns

A quarter turn is one of four equal parts of a full turn. It changes direction by a right angle, or 90∘90^\circ.

To recognize one:

  1. Look at the object’s starting direction.
  2. Look at its ending direction.
  3. Check whether it moved one step around a full turn:
    • clockwise: up to right, right to down, down to left, or left to up;
    • anticlockwise: up to left, left to down, down to right, or right to up.
  4. If it moved one of these steps, it made a quarter turn.

Example: An arrow starts pointing up. It turns clockwise and finishes pointing right. What turn did it make?

  • Start: pointing up.
  • Move clockwise one direction: up to right.
  • This is one of four equal parts of a full turn.

So, the arrow made a quarter turn clockwise.

Learn by doing: Recognize quarter turns

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    Turns - Quarter Turn - Final Image to Turn Amount

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