anonymous
  • anonymous
Jackson wants to paint a 3-foot border around the edge of the floor in his room. He drew this diagram to show how it should look. What area of the floor will remain unpainted i will draw the square
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
|dw:1434142922283:dw|
mathstudent55
  • mathstudent55
You mean a 3-ft border all around inside the room like this? |dw:1434143162361:dw|
anonymous
  • anonymous
how'd you no exept that the border is wite

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mathstudent55
  • mathstudent55
The 3-ft border is going to be painted. The crosshatched area inside will not be painted. The question is what is the area of the crosshatched area inside.
anonymous
  • anonymous
ok
mathstudent55
  • mathstudent55
The inner area that will not be painted is in the shape of a rectangle. Do you know how to find the area of a rectangle?
anonymous
  • anonymous
multiply the top and sides
mathstudent55
  • mathstudent55
Good. Multiply the length by the width.
mathstudent55
  • mathstudent55
We need the length and width of the inner rectangle. Let's see how we can find them.
anonymous
  • anonymous
140?
mathstudent55
  • mathstudent55
No. 140 ft^2 is the area of the large outside rectangle. You calculated the area correctly, but it's the wrong rectangle. We need the area of the smaller inner rectangle. We need the length called L in the figure below. |dw:1434143597247:dw|
mathstudent55
  • mathstudent55
Notice length L of the smaller rectangle. Its length is the large length, 14 ft, with 3 ft taken away from each side. What is the length L?
anonymous
  • anonymous
12?
mathstudent55
  • mathstudent55
No. See figure below. |dw:1434143969274:dw|
mathstudent55
  • mathstudent55
What is 14 - 3 ?
mathstudent55
  • mathstudent55
Sorry, gtg.
mathstudent55
  • mathstudent55
Take the length of the outer rectangle, 14 ft, and subtract 3 ft twice. Then take the width of the outer rectangle, 10 ft, and subtract 3 ft twice. That will give you the length and width of the inner rectangle. Then multiply that length and width of the inner rectangle to find its area.
anonymous
  • anonymous
i don't geeet iiiit

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