If a circle has a diameter of 10 cm and a circumference of 31.4 cm, how would you write a ratio to determine the value of pi?

C/d = 31.4/10

Step-by-step explanation:

We know the formula of the circumference, which ir:

C = pi*d

Where C is the circumference and d is the diameter of the circle. If we want to know the value of the pi number we just need to divide both sides of the equation above by d:

C/d = pi*d/d

C/d = pi

Thus, we can write pi as the ratio C:d or C/d, which means, how many times the diameter enters on the circumference. In our case is:

pi = 31.4/10 = 3.14

And 3.14 is how we usually use the pi number.