Question

A circle has a diameter of 300m. What is his circumference using pi?

Answer 1

To find the circumference using π = 3.14, we can proceed as follows:

1. The formula to find the circumference of a circle is:

`C=2\pi r\Rightarrow D=2r\Rightarrow C=D\pi`

2. That is, given the diameter, we can use it directly into the answer, since twice the value of the radius is the diameter of the circle:

`C=300m\cdot3.14=942m`

If we find the radius as:

`D=2r\Rightarrow r=(D)/(2)=(300m)/(2)=150m`

And If we use the next formula:

`C=2\pi r=2\cdot3.14\cdot150m=942m`

As we can see, in both cases, we found that the value for the circumference is equal to 942 meters (if we use π = 3.14).

In summary, the circumference of a circle that has a diameter of 300 meters is equal to 942 meters (C = 942m) (using π = 3.14).