Question

how do u show that ABCD is a parallelogram

Answer 1

@mathmath333

Answer 2

@Vocaloid

Answer 3

find the length of AD and BC first

Answer 4

@phi

Answer 5

how im i supposed to do that @mathmath333

Answer 6

use pythagorus for AD

Answer 7

ok

Answer 8

there are 2 ways:
show opposite sides have the same length (use the "distance formula")
or
show opposite sides have the same slope

finding the slope is probably less work.

to do either way, you first need the (x,y) coords of each corner.

Answer 9

Here are the 4 points
A (0,4)
B (5,6)
C (6,2)
D (1,0)

now show the slopes of AB and CD are the same
can you do that ? (remember slope is change in y divided by change in x)

Answer 10

im i suppose to divide 0,4 @phi

Answer 11

nevermind

Answer 12

do you remember how to find the slope between
(0,4) and (5,6) ?

Answer 13

i have to subtract 4 and 6

Answer 14

then subtract 0 and 5 and divided???

Answer 15

is the slope 2/5 @phi

Answer 16

yes. the side AB has slope 2/5
the opposite side is CD
find the slope between points C and D

Answer 17

5/2

Answer 18

you should get 2/5 . remember it is change in y divided by change in x
(6,2)
(1,0)

Answer 19

ooo ok

Answer 20

do i do the same for number 74

Answer 21

you are not done yet.
you also have to show the sides AD and BC have the same slope
(opposite sides have the same slope)
so far you showed sides AB and CD have the same slope.
now do AD and BC

Answer 22

slope for AD is 1/4

Answer 23

close but not 1/4 . also notice it should be negative (the line slopes down)

Answer 24

1/-4

Answer 25

show your work

Answer 26

what is change in y?
what is change in x ?