Unit 3, Lesson 16, Grade 7 icon
Unit 3, Lesson 16

The Most Famous Ratio of All

EngageNY 45 min(s)

Students develop the definition of a 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. Students know the formula for the circumference of a circle, of diameter, and radius. Although students were introduced to circles in kindergarten and worked with angles and arcs measures in Grades 4 and 5, they have not examined a precise definition of a circle.

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