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let's first draw `Isosceles trapezoid ABCD`
|dw:1443240259301:dw|

|dw:1443240338434:dw|

now let's have `line ZX drawn through its center`
|dw:1443240353329:dw|

ah so the line is going through the center of the trapezoid vertically

it doesn't have to, but it's the easier ways to draw it I think

what happens to A,B,C,D if we apply that scaling?

it should be smaller, right?
|dw:1443240673390:dw|

what do you notice about ZX and A'B'C'D' ?

everything gets 1/3 closer to the center

So the new line Z'X' is simply 1/3 the original length of line ZX?

lines in geometry are infinitely long

if it were a line segment, then yes

ZX is a line segment though, right?

but they call it `line ZX`. They don't use segment at all

yeah exactly

alright thanks for the help then, its much appreciated

no problem