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Question

Difficulty: Easy2D Mental Rotation

A square panel has a single alignment notch located on its top edge. The panel is continuously rotated flat on a table in consecutive 90-degree clockwise increments. In what chronological sequence will the alignment notch appear in the following positions, starting immediately after the first 90-degree rotation?

  1. 1The notch is located on the right edge
  2. 2The notch is located on the bottom edge
  3. 3The notch is located on the left edge
  4. 4The notch returns to the top edge

Answer

The correct sequence tracks the notch moving clockwise in 90-degree increments: first to the right edge, then to the bottom edge, next to the left edge, and finally back to the top edge.
Starting from the top, a 90-degree clockwise rotation shifts the tracked feature to the right side (acting like a clock hand moving from 12 to 3). The next 90-degree turn moves it to the bottom (6 o'clock), followed by the left side (9 o'clock), and a final 90-degree turn completes the circle, bringing it back to the top (12 o'clock).

Step-by-Step Solution

1
Identify the starting position of the feature being tracked.
The alignment notch begins on the top edge of the square panel.
Establishing an initial reference point is necessary before applying any spatial transformations.
2
Apply the first 90-degree clockwise rotation mentally.
The top edge rotates to become the right edge, bringing the notch with it.
A 90-degree clockwise turn always shifts a feature on a square to the next adjacent side in a clockwise direction.
3
Track the feature through subsequent 90-degree clockwise rotations.
The notch moves to the bottom edge (at 180 degrees), then the left edge (at 270 degrees), and finally the top edge (at 360 degrees).
Continuing the rotation in the same direction continues to advance the feature to consecutive edges.

Key Concept

2D Mental Rotation and Feature Tracking
Estimated Time:30s
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Topics

2D Mental Rotation

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