How to find the thermal expansion coefficient?

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To find the thermal expansion coefficient, one must analyze the provided data in the example question. The coefficient is defined as the ratio of change in length to the original length per degree change in temperature. Given that the coefficient α is specified as 20 x 10-6 °C-1, it can be utilized directly if the relevant measurements are available. The calculation typically involves measuring the change in dimensions of a material as temperature varies. Understanding this concept is crucial for applications in materials science and engineering.
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following is an example question i found on a lecture slide. I need some explanation to understand it.

http://img266.imageshack.us/img266/7062/thermal.png

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In this example, Is it possible to get the thermal expansion coefficient from the data given in the question? if then, how to do that?
 
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The thermal expansion coefficient α is given, α = 20 x 10-6 °C-1.
 

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