What is the circumference of this circle with a diameter of 15cm? Use π ≈ 3.14. Round your answer to the nearest tenth of a centimeter.
A.

94.2 cm
B.

47.1 cm
C.

23.6 cm
D.

176.6 cm

Question

What is the circumference of this circle with a diameter of 15cm? Use π ≈ 3.14. Round your answer to the nearest tenth of a centimeter.
		A. 	

94.2 cm
		B. 	

47.1 cm
		C. 	

23.6 cm
		D. 	

176.6 cm

jabez177 · Answer

$$C=2\pi r$$

jabez177 · Answer

So the Radius is half of the Diameter. 
What is 15 / 2?

jabez177 · Answer

@deaththekid975, you can use a calculator. :)

deaththekid975 · Answer

7.5

mrnood · Answer

you might also notice
2πr  = π* 2r = πD

so you can work directly with D

jabez177 · Answer

$\color{#0cbb34}{\text{Originally Posted by}}$ @deaththekid975
7.5
$\color{#0cbb34}{\text{End of Quote}}$
Right. Now we know PI = 3.14 so we multiply 3.14 x 7.5

mrnood · Answer

@jabez177 it is 2 * pi *r

jabez177 · Answer

I know.
Or we could do $$2\times3.14\times7.5$$

mrnood · Answer

@deaththekid975 
It is not acceptable to let someone else give the answer
all the help you need is given

please do the multiplication yourself....

jabez177 · Answer

@DeathTheKid975, multiply straight across to get your answer. $$2\times3.14\times7.5=Your~answer.~:)$$