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Make a triangle, Pythagorean theorem.

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|dw:1349496154838:dw|

1?

Here are the choices:
A. 1
B. 109
C. 10.4
D. 3

is 1 the correct answer?

|dw:1349496503466:dw|

1 doesn't seem very reasonable for points that far apart.

10.4?

oh i just counted how long the triangle's height was on the picture you drew, and i counted 10

is it right?

ok i'll try it....i'll tell you what i get

oh wait

how do i put (2,5) and (-1,-5) in that equation

coordinates are (x,y) so substitute the coordinates' x's and y's

109?

yup, now don't forget to take aquare root.

*square

oh thank you! so it's 10.4 :D

welcome :)

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