For all of high school, I thought that the radius of the circle was the distance around the circle instead of the distance from the middle of the circle to the outer edge. I know for a fact that this has affected my grade on multiple tests.

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Today's Best Deals: Philips Hue, New Balance, Model Cars, and More

New Balance apparel, a Philips Hue starter kit, and beautiful model cars lead off Thursday’s best deals from around the web.

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