Hi, Can any body help me?
I have xy coordinates of a line (like 10 points), how could I calculate the length of the line

Question

amistre64 · Answer

add up the distances from point to point for a good approximation

amistre64 · Answer

then divvy up you interval into an infinite number of partitions and measure each point

anonymous · Answer

Divvy means?

amistre64 · Answer

by line, you mean a straight line?  or just some curve drawn in pencil?

amistre64 · Answer

divide

anonymous · Answer

ok

anonymous · Answer

curved line

amistre64 · Answer

$$\int_{a}^{b}\sqrt{1+[f'(x)]^2}dx$$

anonymous · Answer

what is this? can you explain me?

amistre64 · Answer

if you just have the 10 points; then the distance from point to point added up should be fine

anonymous · Answer

ok

amistre64 · Answer

thats calculus; its the divving up of the interval from a to b an infinite number of times and adding up the points

amistre64 · Answer

|dw:1324503888405:dw|

anonymous · Answer

So I can use that formula to find the length.

amistre64 · Answer

you can, but its not what they want you to do :)

the distance from point to point is thge pythag thrm

amistre64 · Answer

$$x^2+y^2 = s^2$$
$$s = \sqrt{x^2+y^2}$$

amistre64 · Answer

and of course x and y here stand for the distance between the points

amistre64 · Answer

you got 2 points I can give an example on?

anonymous · Answer

so, x is the first point (x1,y1) and y is the second point coordinates (x2,y2)
X = (x1-x2), Y=(y1-y2)
is this correct?

amistre64 · Answer

yeah, thats good

anonymous · Answer

then I have to add all s1,s2,s3

amistre64 · Answer

yep

amistre64 · Answer

otherwise it be kinda hard to determine what they sum up to be :)

anonymous · Answer

I have another question. Can you help me?

amistre64 · Answer

wish i could, but I gotta run.  good luck :)

anonymous · Answer

ok thanks