anonymous
  • anonymous
Math question! Help please! Semester test tomorrowww!!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
There it is :(
anonymous
  • anonymous
The answer for part B, the one I don't get is 3050, but I don't know how to get there.
mathstudent55
  • mathstudent55
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anonymous
  • anonymous
Who told you the answer for B is 3050? That's not what I came up with.
anonymous
  • anonymous
Even though that's a REALLY big number, I realize I forgot to calculate the internal diameter. Hold on.
anonymous
  • anonymous
Okay. I think I've got the answer. Can you tell me how you started this problem?
anonymous
  • anonymous
The textbook says that..
anonymous
  • anonymous
Textbook's wrong. Over THREE THOUSAND washers can be carved from one square meter of metal?
anonymous
  • anonymous
Yes, so I did 3/0.0004= 7500 and thats the number of washers for question a
anonymous
  • anonymous
How did you get .0004?
anonymous
  • anonymous
Oh my gosh, never mind I get it!!
anonymous
  • anonymous
What do you get?
anonymous
  • 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
  • anonymous
So it is 3050 :)
anonymous
  • anonymous
What's 3050?
anonymous
  • 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
  • anonymous
I found the AREA of the entire washer, sorry. That's .0314 meters squared.
anonymous
  • 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
  • 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
  • anonymous
Can you tell me how you got .0004?

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