CCG 8-100 Student eTool | Desmos

b. What is the ratio of the circumferences (perimeters)? What is the ratio of the areas? Explain.

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c. If the area of a circle with radius of 1 is π square units, what is the area of a circle with radius 3 units? With radius 10 units? With radius r units?

5

d. Likewise, if the circumference (perimeter) of a circle is 2π units, what is the circumference of a circle with radius 3 units? With radius 7 units? With radius r units?

6

HINT: Drag the slider to explore circle area and perimeter for various radii.

7

Expression 8: "r" equals 3

1

9

8

9

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"r" equals 3

Area =

9 pi

square units

Perimeter =

6 pi

units

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