# How do you find the area if diameter is 12 cm?

##### 2 Answers

Sep 20, 2015

I found:

#### Explanation:

Consider that radius

Area

Sep 20, 2015

#### Explanation:

I assume you meant "the area of a disk" because you say "diameter" (but it is not so clear from the question, you could have meant the area of a "sphere" (which is in 3D), but I am assuming you are talking about a "disk").

There is a simple formula for the area of a disk:

where r is the radius.

The diameter is twice the radius (by definition).

So in our case, since the diameter is 12cm,

the radius is 6cm.

Thus, the Area of a disk of diameter 12cm is:

i.e.

That's it! Hope that helped.