Question

Victor measured a circular lid and found d, the diameter, was 8 inches and c, the circumference was 25 inches.

Answer 1

Answer:

If you know the diameter or radius of a circle, you can work out the circumference. To begin with, remember that pi is an irrational number written with the symbol π. π is roughly equal to 3.14.

Step-by-step explanation:

The formula for working out the circumference of a circle is:

Circumference of circle = π x Diameter of circle

This is typically written as C = πd. This tells us that the circumference of the circle is three “and a bit” times as long as the diameter."

Answer 2

And we also know that circumference C =25 inches and the formula for this circumference is given by:

We want to find the value of and solving from the last equation we got:

And replacing we got:

So then the approximation for the value of and that's very close to the real value of
Step-by-step explanation:
For this case we know that the diameter d =8 in. And we can find the radius from this info since d = 2r with r representing the radius. If we solve for r we got:

And we also know that circumference C =25 inches and the formula for this circumference is given by:

We want to find the value of and solving from the last equation we got:

And replacing we got:

So then the approximation for the value of and that's very close to the real value of