Geometry Vocabulary

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dilation (noun)

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A transformation that changes the size of a figure but not its shape. It's like zooming in or out on a picture. Example Sentence: The artist used a dilation to make the painting appear larger on the canvas.

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proportional (adjective)

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Having the same ratio or relationship. Two quantities are proportional if they increase or decrease at the same rate. Example Sentence: The amount of money you earn is proportional to the number of hours you work.

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corresponding (adjective)

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Matching or relating to something else in a similar way. In geometry, corresponding sides or angles are in the same position in two similar figures. Example Sentence: The corresponding sides of the two triangles are in the same ratio.

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similar (adjective)

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Having the same shape but not necessarily the same size. Similar figures have corresponding angles that are equal and corresponding sides that are proportional. Example Sentence: The two triangles are similar because they have the same shape, even though they are different sizes.

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pre-image (noun)

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The original figure before a transformation, like a dilation or rotation. It's the starting point of the transformation. Example Sentence: The pre-image of the triangle was smaller than the image after the dilation.