when reducing or enlarging the dimensions you obviously have to change the dimensions. but do not change the ratio of the vaules. also do not cahnge the unit of the values.
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If they are enlarged or reduced so that their corresponding sides are the same measure. Actually, only one pair of corresponding sides needs to be of the same measure. Then the similarity ensures all others are as well.
The three types of dilations are an enlarged image (the image is larger than the preimage), a reduced image (the image is smaller than the preimage) and an equal image (the image is the same size as the preimage).
If it is a 2-dimensional figure then it is proportional.
Length is one of the dimensions. Length, width, height etc. which can describe an object are called its dimensions.
If you double the cross-sectional area and halve the length, you will still have the same volume but the dimensions will be different.