Answer: D. The ratio of a circle's circumference to its diameter
Step-by-step explanation:
Pi is the ratio of the circumference of a circle to its diameter which means that we get pie by dividing the circumference by the diameter. This relationship is true regardless of the size of the circle because the relationship between the circumference and the diameter does not change regardless of size.
Pi is very useful when calculating measures related to circles such as area and circumference. It also comes in handy for shapes that have circles in them such as cones.
X=10 I think I’m not sure
Answer:
Step-by-step explanation:
We have the system of equations:
Let's solve by substituting. We know that 
, so we can substitute 
in as 
in the equation 
.
Simplify this down so that we have 
on one side of the equation:
Now that we know the value of , we can substitute it in to the equation 
to find .
Hope this helped!
