Question

A circle has a diameter of twelve millimeters. What are the circumference and area of the circle? Use three point one four for pi. Round to the nearest tenth.

thirty-seven point seven millimeters; four hundred fifty-two point two square millimeters

eighteen point eight millimeters; one hundred thirteen point zero square millimeters

thirty-seven point seven millimeters; one hundred thirteen point zero square millimeters

eighteen point eight millimeters; four hundred fifty-two point two square millimeters

Answer 1

All under the assumption that
\[\large \pi = 3.14\]

Use these formulas...
\[\Large Circumference = d \color{red}\times \pi\]
\[\Large Area = \frac14 \color{red}\times d\color{red}\times d\color{red}\times\pi\]

Answer 2

i dont get it

Answer 3

d is the diameter.

Answer 4

So, for example, if our diameter was 5, then the circumference would be...
\[\Large Circumference = 5 \color{red}\times \pi\]\[\Large Circumference =5\color{red}\times3.14 \]\[\Large Circumference = 15.7\]

Answer 5

so 15.7xd

Answer 6

Nope... that was an example.

Answer 7

oh... okay.....

Answer 8

Here, your diameter is 9
so just take d = 9
and solve.

Answer 9

okay thanks bye

Answer 10

Wait no it isn't.

Answer 11

Sorry, d = 12
not 9
I'm getting drowsy...