Calculate the length of the circumference of a circle with diameter of 9cm

Hello!

We must use a certain formula to find the circumference of a circle. The formula is:

C = 2 × pi × r

We have the diameter of the circle, so we'll be able to find its radius, since radius is always half the diameter.

r = d ÷ 2

r = 9 ÷ 2

r = 4.5

So, the radius of the circle is 4.5 centimetres. Pi equals approximately 3.14. Substitute:

C = 2 × 3.14 × 4.5

C = 6.28 × 4.5

C = 28.26

ANSWER:

The circumference of the circle is 28.26 centimetres long.

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.