Two geometry problems -->

[iSaInt]

Hey I was wondering if someone could help me out with these.
If you can, thanks so much =]

Honestly I have no idea how to do these =P

Here they are:

Determine the distance between D(-5, 10, -2) and E(11, 22, 14). Round to the nearest tenth.
and
Find the midpoint of the segment with endpoints P(0, 0, 4) and Q(0, -1, 6).

The answers I can pick from are:

34.7
7.1
25.6
6.6
and
(0, 0.5, -1)
(0, -0.5, 5)
(0, -1, 10)
(0, -2, 20)

Thanks.

 

[Deleted member 4993]

Hey I was wondering if someone could help me out with these.
If you can, thanks so much =]

Honestly I have no idea how to do these =P

Here they are:

Determine the distance between D(-5, 10, -2) and E(11, 22, 14). Round to the nearest tenth.
and
Find the midpoint of the segment with endpoints P(0, 0, 4) and Q(0, -1, 6).

The answers I can pick from are:

34.7
7.1
25.6
6.6
and
(0, 0.5, -1)
(0, -0.5, 5)
(0, -1, 10)
(0, -2, 20)

Thanks.

For a quick review, go to:

http://www.purplemath.com/modules/distform.htm

and

http://www.purplemath.com/modules/midpoint.htm

 

[stapel]

Determine the distance between D(-5, 10, -2) and E(11, 22, 14). Round to the nearest tenth.
and
Find the midpoint of the segment with endpoints P(0, 0, 4) and Q(0, -1, 6).

Note: The three-dimensional versions of the two-dimensional Distance Formula and Midpoint Formula (provided in the links in the previous reply) are:

. . . . .\(\displaystyle \mbox{Distance Formula: }\, d\,=\, \sqrt{(x_2\, -\, x_1)^2\, +\, (y_2\, -\, y_1)^2\, +\, (z_2\, -\, z_1)^2}\)

. . . . .\(\displaystyle \mbox{Midpoint: }\, \left(\frac{x_1\, +\, x_2}{2},\, \frac{y_1\, +\, y_2}{2},\, \frac{z_1\, +\, z_2}{2}\right)\)