DC Circumference Investigation

Circumference Data Collection

Directions for Data Collection

Use the circle above to collect at least five data points in the data table. Vary the radius of the circle across five trials. For each trial, record the corresponding diameter and circumference in the data table .

Question #1

Based on the recorded data, complete the table by calculating the ratio 𝐶/𝑑 for each measurement. The ratio C/d is equal to--------.

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Question #2

Knowing that 𝜋 = 3.14, choose the equation that relates the circumference of a circle to its diameter.

Select all that apply

A
d=C𝜋
B
𝜋=Cd
C
C=𝜋d

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Question #3

Calculate the circumference of a circle of radius 2.4 cm.

Select all that apply

A
7.53 cm
B
15 cm
C
27 cm

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Question #4

A Grade 7 student measured the diameter and the circumference of a wheel. Suggest a method, using calculation, to check whether the student’s measurements are valid.