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Find the distance between the two points. Round to the nearest tenth if necessary. (2, 5) and (–1, –5)

Mathematics
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Make a triangle, Pythagorean theorem.
or you could use this : Distance between points (x1,y1) and (x2,y2) is \(\huge d=\sqrt{(x_1-x_2)^2+(y_1-y_2)^2}\)
Distance formula is derived from Pythagoras' Theorem, I've found it's easier for students to remember the one formula than have to memorize another one.

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Other answers:

|dw:1349496154838:dw|
It's easy enough to see what the lengths of the legs of the triangle are, then solve for the hypotenuse.
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?
That seems more reasonable, but how can you be sure? What if it wasn't a multiple choice question and you had to provide an exact value, not just one rounded to the tenths' place?
oh i just counted how long the triangle's height was on the picture you drew, and i counted 10
is it right?
Ah, no. You have to use Pythagorean Theorem to find the hypotenuse of the right triangle. |dw:1349498042456:dw| Or perhaps you would have been better off using the distance formula hart provided..
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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