Resizing while preserving proportions

Lesson guide

Open resize-tag-start.lzrproj. The rectangle is 80 × 30 mm and the circle is 4 × 4 mm. They are separate objects.

1. Click empty canvas, then use Cmd + A on Mac or Ctrl + A on Windows/Linux. Confirm 2 objects selected in Properties.
2. Try dragging a corner handle with no modifier key. Proportions stay locked. Use Cmd + Z or Ctrl + Z to undo this trial.
3. For an exact size, turn the lock between W and H on. Enter W 120 and press Enter or Return. H becomes 45.
4. Clear the selection, then select the circle alone. W and H should both be 6. Compare with resize-tag-complete.lzrproj.

Independent practice

Return to the original design so you can predict the result from its known dimensions.

Reopen resize-tag-start.lzrproj. Select both shapes and make the whole design 100 mm wide, with the W/H lock on. Save a separate project copy.

• Scale factor: 100 divided by 80 = __________
• Predicted height: __________ mm Hole diameter: __________ mm

• Confirm both objects are selected before changing W.
• Check the rectangle and circle separately after resizing.
• Compare with resize-tag-practice-check.lzrproj after making your own attempt.

Explained answer

The scale factor is 100 ÷ 80 = 1.25. Multiply the original height by 1.25: 30 × 1.25 = 37.5 mm. The hole grows too: 4 × 1.25 = 5 mm.

• resize-tag-start.lzrproj

  Demonstration and practice starter. Rectangle 80 × 30 mm; circle 4 × 4 mm.

• resize-tag-complete.lzrproj

  Demonstration answer. Rectangle 120 × 45 mm; circle 6 × 6 mm.

• resize-tag-practice-check.lzrproj

  Independent answer. Rectangle 100 × 37.5 mm; circle 5 × 5 mm.

If the circle stayed at 4 mm, it was probably outside the selection. Undo, select both shapes, and try again from the starter.

Matches the demonstrated Beam Bench 0.2.37 interface. Panel layout may differ in later versions.