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what trouble are you having?

identifying the coordinates for C and D?

Yes I don't know how to solve the problem overall

so what coordinates are you going to assign to C?

2a?

c has cordinates of 2a, b?

notice D lays on the horizontal line y=0
any point falling on y=0 has y-coordinate 0

|dw:1437369388989:dw|
what number are you going to put in place of that ?

umm 2a squared

|dw:1437369720333:dw|

ok

now we want to verify that is a trapezoid

So we need to show the slope of line segment BC is the same as the slope of the line segment AD

so line BC has points (a,b) and (2a,b)
so it's slope is?

I don't know actually.

oh ok

anyways we also need the slope of the side that is opposite to BC

What did I say the slope of any horizontal line is?

0?

0/3a

in short 0/(3a)=0

thank you

np
do you have anymore question about this question?

I'm about to vanish into thin air

no thank you though

abracadabra