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Teacher and Student versions of full lesson from engageNY
Students develop the definition of circle using diameter and radius.
Students know that the distance around a circle is called the circumference and discover that the ratio of the circumference to the diameter of a circle is a special number called pi, written ?.
Students know the formula for the circumference C of a circle of diameter d and radius r. They use scale models to derive these formulas.
Students use 22/7 and 3.14 as estimates for ? and informally show that ? is slightly greater than 3.
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