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find the length of AD and BC first
how im i supposed to do that @mathmath333
|dw:1440709546470:dw| use pythagorus for AD
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.
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)
im i suppose to divide 0,4 @phi
do you remember how to find the slope between (0,4) and (5,6) ?
i have to subtract 4 and 6
then subtract 0 and 5 and divided???
is the slope 2/5 @phi
yes. the side AB has slope 2/5 the opposite side is CD find the slope between points C and D
you should get 2/5 . remember it is change in y divided by change in x (6,2) (1,0)
do i do the same for number 74
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
slope for AD is 1/4
close but not 1/4 . also notice it should be negative (the line slopes down)
show your work
what is change in y? what is change in x ?
0,4 1,0 0 minus 1 is -1 4 minus 0 is 4
ok, and which is change in y
remember the points are (x,y) pairs in other words, 4 - 0 is the change in y the slope will be (4-0)/(0-1) = 4 / -1 = -4
finally show line BD has slope -4
for Q74, show line LM has slope m and line MN has slope -1/m (flipped and negated)