An automobile tire has a diameter of 63 cm. What is the circumference of the? tire? (Use pi equals3.14 as an approximate? value.)

Question

An automobile tire has a diameter of 63

cm. What is the circumference of the? tire? (Use pi
equals3.14
as an approximate? value.)

Answer 1

Half the diameter is the radius which is needed for the following equation:

 

C = 2pi*r

 

C = 2(3.14)(31.5)

 

C = 197.82

 

 

Answer 2

Hi Jessica,

 

The equation for circumference is

C = 2πr or

C = πd

 

We have the diameter, 63 cm and the numerical value of pi, 3.14

 

C = (3.14)(63) = 197.82 cm