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AvantiA
29.07.2019 •
Mathematics
(fill in the blank) lamar is writing a coordinate proof to show that a segment from the midpoint of the hypotenuse of a right triangle to the opposite vertex forms two triangles with equal areas. he starts by assigning coordinates as given.
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Ответ:
1. Coordinates of N=(a,b).
2. Area of ΔKNM=ab.
3. Base of ΔMNL= 2a and height =b.
Explanation
1. Given: ΔKML in which N is the midpoint of L(2a,0) and and K(0,2b)
By mid point theorem the coordinates of N =![(\frac{2a+0}{2},\frac{0+2b}{2}=(a,b)](/tpl/images/0145/3566/cb065.png)
2. Given: In ΔKNM , base MK=2b and height=a then
Area of ΔKNM=![\frac{1}{2}base\times\ height=\frac{1}{2}\times2b\times\ a=ab](/tpl/images/0145/3566/8bf0e.png)
3.Given: Area of ΔMNL =ab
base of ΔMNL=2a ,across x axis.
Now ,
Arera of ΔMNL
Ответ:
Approximately x/150 students prefer sf
60x = 1800
x = 30
30/150 students are assumed to prefer sf
30/150 = x/100
150x = 3000
x = 20
20/100 students are likely to prefer sf
Mr. Rodriguez made a reasonable estimate for the approximate percentage of students that prefer science fiction, because if 12/60 is equivalent to 30/150 which refers to the number of students who can be assumed to prefer science Fiction out of the whole school. Considering we need to identify what 30/150 as a percentage is, we can reduce it down to 1/5 to make I easier, then divide 1 by 5 to get .2
.2 as a percentage is 20%, so his inference was indeed reasonable.
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