Describing Pi 7.5B

The equation  $C=\pi d$  , is used to find the circumference of a circle given it's diameter. This formula can be rearranged to solve for pi. Which equation is written correctly to solve for pi?

• $\pi=Cd$
  

• $\pi=\frac{C}{d}$

• $\pi=\frac{d}{C}$
  

• $\pi=C-d$
  

What is the "formal" definition of pi?

• 22/7
• 3.1415926
• the ratio of a circle's circumference to its diameter
• the surface area of a sphere of diameter 22/7

Tags

CCSS.HSG.GMD.A.1

Is pi irrational, rational, both, or neither?

• Both
• Irrational
• Rational
• Neither

Tags

CCSS.8.NS.A.1

A circle has a diameter of 8 cm. Which equation could be used to represent the circumference of the circle? Use  $\pi\approx3.14$  .

•  $\frac{C}{8}\approx3.14$  

•  $C\approx3.14\left(4\right)^2$  

•  $\frac{C}{4}\approx3.14$  

•  $C\approx2\pi\left(8\right)$  

The circumference of a circle is C centimeters. The diameter of the circle is 13 centimeters. Which expression best represents the value of  $\pi$  ?

•  $\frac{C}{6.5}$  

•  $\frac{6.5}{C}$  

•  $\frac{C}{13}$  

•  $\frac{13}{C}$  

A group of students formed a circle during a game. The circumference of the circle was about 43.96 feet, and the diameter of the circle was 14 feet. Which expression best represents the value of  $\pi$  ?

•  $\frac{43.96}{7}$  

•  $\frac{43.96}{14}$  

•  $\frac{7}{43.96}$  

•  $\frac{14}{43.96}$  

Which of these best describes  $\pi$  ?

• The square root of the area of a circle

• The ratio of the radius of a circle to its diameter

• The radius of a circle times 3.14

• The ratio of the circumference of a circle to its diameter