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Home > CC3 > Chapter 3 > Lesson 3.2.2 > Problem 3-86


Find the area and circumference of a circle with a diameter of cm. If you need help remembering how to do this, read the Math Notes box in this lesson.

Remember the the area of a circle is and the circumference of a circle is .

The radius of a circle is half the diameter.

radius cm



A circle with a horizontal line through the center, labeled, diameter = 15 cm.