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Exploring circles

December 3, 2014

Today in grade 9 we made circles out of string, measured the circumference, and measured the diameter.

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We graphed diameter on the horizontal axis, and circumference on the vertical axis.

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We looked at the line of best fit, calculated the slope and looked at the y intercept.

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The correlation was strong, direct, linear, and positive. The slope was just more than 3, and we determined that the slope should be pi.

Some minds were blown.

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