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First select the center and a point on the pre-image. Then select the center point that corresponds to the previous selected point.

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To find the scale factor you would need to find the measurement of seg. AB and the measurement of seg. A'B'. You would then do the length of A'B' divided by the length of AB.

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Measure the distance from the center point Z to a point on the pre-image. Then measure the distances. Repeat these steps using the image. Then calculate the ratio by dividing the two segments distances. You have now calculated the scale factor of the dilation.

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Select the center point (Z) and any segment from the pre-image. Repeat this with the center point and the segment in the image that corresponds with the pre-image. You then divide the image's segment measurement and the pre-image's measurement, where you then find the scale factor.

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You would find the length of a segment in the preimage (Such as AB) and find the distance of those same two points in the image (A'B'). You would then divide the image by the preimage and find the scale factor

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Take the length of one side of the image and divide it by the  length of the corresponding side of the pre-image

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You have to find the scale factor of the dilation by taking the length of one side of the image such as AB and then taking the side of A'B' and dividing the two measures.

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Measure the distance from point Z (the center) to a point on the pre-image. Repeat this for the other three points. The scale factor should be the same for each point from point Z. The scale factor can be determined by dividing

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You have to find the scale factor of the dilation by taking the measures of the center and any point and then divide the two lengths.

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First measure the distance between Z and a point on the pre-image. Then measure the distance between Z and the same point on the image. Divide the two measurements to get the scale factor.

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Measure the distance from the center to a point on the pre image

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You first would have to select the center and select the pre-image. After you find the measure to that you highlight the center and the corresponding point to the point that was selected when finding the pre-image measurement. After you calculate the distance between the center and the image you divide the measurement of the center to the image by the measure of the center to the corresponding point to get the scale factor

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First select the center point which is Z. Then select a pre-image point from point Z like A and find the distance. Then select the center point again and find the distance between the center and A'. To find the ratio divide the two distances  ZA' /ZA. The ratio will be the same for each ray.

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you would have to find the measurements of both segment AB and A prime and B prime and so on. then take the two measurements segment AB and A prime and B prime, and divide the two.