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4 May, 00:23

Sarah has built a scale model of a bridge. The real bridge is 56 ft across and 21 ft wide. Sarah's model is 8 in. across and 2.5 in. wide. Is Sarah's model a true model of the bridge? Explain.

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  1. 4 May, 00:41
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    To determine if the model is a true model. Solve for the scaling used for both the measurement across and the width. The scaling of both should be the same.

    (across) 56 ft / 8 in = 7 ft per 1 inch

    (width) 21 ft / 2.5 in = 8.4 ft per 1 inch

    Since, the scalings are not the same then, Sarah's model is not a true model of the bridge.
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