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annipuppi
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The coordinates for a rhombus are given as (2a,0), (0,2b), (2a,0), and (0,2b). Write a plan to prove that the midpoints of the sides of a rhombus determine a rectangle using coordinate geometry. Be sure to include the formulas
 11 months ago
 11 months ago
annipuppi Group Title
The coordinates for a rhombus are given as (2a,0), (0,2b), (2a,0), and (0,2b). Write a plan to prove that the midpoints of the sides of a rhombus determine a rectangle using coordinate geometry. Be sure to include the formulas
 11 months ago
 11 months ago

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myininaya Group TitleBest ResponseYou've already chosen the best response.1
So you want the slopes of the intersecting line segments to be perpendicular, agreed?
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
and I mean not the slopes to be perpendicular but the line segments to be perpendicular i said that a little wrong errr but anyways the reason slopes came into mind is because we know what about the slopes if the line segments are perpendicular?
 11 months ago

annipuppi Group TitleBest ResponseYou've already chosen the best response.0
They are the opposite recipricols and I knew what you meant haha
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
and i guess they were talking about the midpoints
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
not where the line segments intersect
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
dw:1386186685552:dw pretend that is perfect
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
they already give you the midpoints
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
just show the slopes are undefined and 0 with those points given
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
like look at one line segment at a time Take the line segment with (a,b) and (a,b)
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
find the slope
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
then do the same with the line segment going through (a,b) and (a,b)
 11 months ago

annipuppi Group TitleBest ResponseYou've already chosen the best response.0
how do you find the slope of that though?
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
do you know the slope formula? Also what do you know about the slopes of vertical lines and horizontal lines without using the slope formula?
 11 months ago

annipuppi Group TitleBest ResponseYou've already chosen the best response.0
yeah and the slope of horizontal lines is 0 and the slope of vertical lines is undefined but how do we know they are horizontal and vertical lines?
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
all the points on x=a have what in common?
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
look at the line segment going through the midpoints
 11 months ago

annipuppi Group TitleBest ResponseYou've already chosen the best response.0
oh I see now. nevermind that was a stupid question. Okay so now that I know the slopes of each line how do I prove its a rhombus?
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
you were trying to show that one thing is a rectangle
 11 months ago

annipuppi Group TitleBest ResponseYou've already chosen the best response.0
oops I meant to say how do I prove its a rectangle
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
we did that by showing the angles were 90 degrees.
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
We show that by showing the line segments were perpendicular.
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
we knew the line segments were perpendicular because one was horizontal and the other was vertical
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
we knew we had a horizontal line segment because all the y values of the coordinates that lied on that line segment were the same
 11 months ago

annipuppi Group TitleBest ResponseYou've already chosen the best response.0
Okay so there arent any formulas that I have to include or anything?
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
we knew we had a vertical line segment because all the x values of the coordinates that lied on that line segment were the same
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
If you want you could use that one formula I mentioned
 11 months ago

annipuppi Group TitleBest ResponseYou've already chosen the best response.0
The slope formula right? but I don't really need it
 11 months ago

myininaya Group TitleBest ResponseYou've already chosen the best response.1
You also might want to use that midpoint formula to show why those points in your picture are midpoints.
 11 months ago

annipuppi Group TitleBest ResponseYou've already chosen the best response.0
Okay. that makes sense. Thanks for your help!
 11 months ago
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