Math question! Help please! Semester test tomorrowww!!

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- anonymous

Math question! Help please! Semester test tomorrowww!!

- chestercat

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- anonymous

There it is :(

##### 1 Attachment

- anonymous

The answer for part B, the one I don't get is 3050, but I don't know how to get there.

- mathstudent55

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- anonymous

Who told you the answer for B is 3050? That's not what I came up with.

- anonymous

Even though that's a REALLY big number, I realize I forgot to calculate the internal diameter. Hold on.

- anonymous

Okay.
I think I've got the answer.
Can you tell me how you started this problem?

- anonymous

The textbook says that..

- anonymous

Textbook's wrong. Over THREE THOUSAND washers can be carved from one square meter of metal?

- anonymous

Yes, so I did 3/0.0004= 7500 and thats the number of washers for question a

- anonymous

How did you get .0004?

- anonymous

Oh my gosh, never mind I get it!!

- anonymous

What do you get?

- anonymous

You know the formula for the area of a circle is (3.14 * r^2) ?
That's why I have no idea where you got the .0004

- anonymous

So it is 3050 :)

- anonymous

What's 3050?

- anonymous

Here's what I did:
I figured out the diameter of the entire washer.
The washer's EXTERNAL DIAMETER is 2 cm.
That means that the radius is 1 cm.
And that means that the area is 3.14 cm squared, which is the same as .0314 meters squared.

- anonymous

I found the AREA of the entire washer, sorry.
That's .0314 meters squared.

- anonymous

But the washer has a hole.
So now we have to find the area of the hole.
The DIAMETER of the hole (INTERNAL diameter) is 1 cm.
That means that the AREA of the hole is....
(3.14 * .5 squared),
which is .785 cm squared.

- anonymous

If you subtract that from 3.14 cm squared,
you get 2.36 cm squared,
which is the same as .0236 meters squared.

- anonymous

Can you tell me how you got .0004?

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