Question

ABCD is a parallelogram with A(-1,3,2) B(2,3,-4) and D(0,1,5) Find its area and the obtuse angle between its diagonals.

Answer 1

What is the value of point

Answer 2

C

Answer 3

im not given C

Answer 4

but one thing that I know for sure is that it is not a parallelogram, it is a 3-D shape

Answer 5

cant we find C?

Answer 6

I am not very sure, I am not very good with geometry.

Answer 7

ok thanks anyways

Answer 8

use distance formulae

Answer 9

how do you find the obtuse angles between its diagonals? what does it mean by that?

Answer 10

M is where the diagonals intersect.
thats the angle they are asking for.

Answer 11

oh ok thanks! :) so how can I figure the angles out if no angles are given?

Answer 12

use cosine rule.

Answer 13

also, the diagonals bisect eachother

Answer 14

alright thanks :)

Answer 15

to find the area, what do i do after I use the distance formula to find the sides