Circumference and Diameter of a Circle

Investigating Pi

Relation between the circumference and diameter of a circle

Based on the values in the last column of your spreadsheet, what can you conclude about the ratio of the circumference of a circle to its diameter, [math]\frac{C}{d}[/math]?

[math]\frac{C}{d}[/math] remains fairly constant regardless of the size of the circle. [math]\frac{C}{d}[/math] varies randomly from circle to circle [math]\frac{C}{d}[/math] decreases as the circle gets larger [math]\frac{C}{d}[/math] increases as the circle gets larger

The ratio C/d

Which of the following mathematical constants does the ratio [math]\frac{C}{d}[/math] remind you of?

the cosine ratio, [math]cos[/math] the tangent ratio, [math]tan[/math] the sine ratio, [math]sin[/math] Pi, [math]\pi[/math]

Find the Circumference

The ratio [math]\frac{C}{d}[/math] for a certain circle is found to be approximately 3.14. What is the circumference of this circle it it has a radius of 5 cm?

15.7 [math]cm[/math] 31.4 [math]cm[/math] 22.7 [math]cm[/math] 34.7 [math]cm[/math]

Circumference and Diameter of a Circle

Investigating Pi

Relation between the circumference and diameter of a circle

The ratio C/d

Find the Circumference

Information: Circumference and Diameter of a Circle