anonymous
  • anonymous
Quadrilateral DEFG is a rectangle with vertices D(–8, 2), E(2, 7), F(5, 1), and G(–5, –4). Find the area of the rectangle. (no image, please help!!)
Mathematics
chestercat
  • chestercat
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Jhannybean
  • Jhannybean
|dw:1439022085208:dw|
anonymous
  • anonymous
oh gosh.. Do i multiply 7 by 5?
Jhannybean
  • Jhannybean
Nope. think of the width of the rectangle as x, and the length as y. |dw:1439022173641:dw|

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anonymous
  • anonymous
ahh so many numbers
Jhannybean
  • Jhannybean
Counting up from 2 \(rightarrow\) to 7, or even from -4 \(\rightarrow\) to 2, how many steps is that?
anonymous
  • anonymous
5?
Jhannybean
  • Jhannybean
|dw:1439023205596:dw| We can use the distance formula to find the distances of x and y. \[x=\sqrt{(2-(-8))^2+(7-2)^2}\]\[y=\sqrt{(2-5)^2+(7-1)^2}\] After finding x and y, just multiply them together. \[A=x\cdot y\]
anonymous
  • anonymous
so what was the answer?

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