Question

A small pizza has a diameter of 21 cm.

What is the approximate circumference of the pizza? Use pi = 3.14.

( ) cm

Answer 1

@sissyedgar @ribhu

Answer 2

OMG! i just did this in class earler! i believe its 65.94!

Answer 3

\(\large\color{black}{ \displaystyle {\rm d} }\) - diameter\(\large\color{black}{ \displaystyle \\[0.4em] }\)
\(\large\color{black}{ \displaystyle {\rm C} }\) - Circumference\(\large\color{black}{ \displaystyle \\[0.4em] }\)

There is a formula: \(\large\color{black}{ \displaystyle {\rm C} ={\rm d}\times {\rm \pi} }\)

plug in your diameter, \(\large\color{black}{ {\rm d}=21 }\)
plug in your approximation for \(\large\color{black}{ {\rm \pi} }\), \(\large\color{black}{ {\rm \pi}=3.14 }\)

Answer 4

\(\large\color{black}{ \displaystyle {\rm C=~}21~\times~3.14 }\)

Answer 5

so its 65.94?

Answer 6

like i said!

Answer 7

thanks!

Answer 8

65.94

Answer 9

How I got my answer:

Keys:

C= Circumference
R= Radius
D= Diameter
3.14= pi

1) D=21 so I took that and divided it by 2 = 10.5 (our Radius)

2) The formula for the circumference of a circle is 2 x 3.14 x r
Plus in the numbers: 2 x 3.14 x 10.5 = 65.94

Answer 10

*Plug in the numbers*