To change a scale drawing from a scale of 1 box = 4 centimeters to a scale of 1 box = 2 centimeters, you will need to reduce the size of the original drawing accordingly.
Here's how you can do it:
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Determine the new dimensions: Since the new scale is half the size of the original (1 box = 2 cm vs. 1 box = 4 cm), you will need to take each original size and divide it by 2.
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Redraw the image: For each dimension in the original drawing, take the measurement and convert it based on the new scale. If an object measured 12 cm originally, it would be scaled down to 6 cm in the new drawing.
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Using your grid: If you are using a grid system (like boxes), make sure that each box in the new drawing represents 2 cm, meaning each original box (4 cm) will now take up 2 boxes in the new drawing.
It's important to illustrate your drawing correctly based on these new dimensions. If you have options for what the new drawing could look like, you would look for the one that correctly reflects this new scale.
If needed, I can guide you through a specific example if you provide the initial dimensions or a drawing that you wish to scale.