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enya.goldBest ResponseYou've already chosen the best response.0
I would use my trusty Distance Formula, although I'm not sure which is which to plug in.
 one year ago

enya.goldBest ResponseYou've already chosen the best response.0
\[d = \sqrt(x _{2}  x _{1})^2 + (y _{2}  y _{1})^2\]
 one year ago

enya.goldBest ResponseYou've already chosen the best response.0
\[d = \sqrt (a  (b)^{2} + (0  c)^2\]
 one year ago

tkhunnyBest ResponseYou've already chosen the best response.2
What is it that you are trying to do? Perimeter? Area? Other?
 one year ago

enya.goldBest ResponseYou've already chosen the best response.0
"Find the lengths of the diagonals of this trapezoid."
 one year ago

tkhunnyBest ResponseYou've already chosen the best response.2
Okay, first, we should observe symmetry and decide that the two diagonals are the same length. Agreed?
 one year ago

tkhunnyBest ResponseYou've already chosen the best response.2
Super. Now, it appears you started working with (a,0) and (b,c). It also appears that you are having some notaiton problems. That's probably why you are struggling with it. There are parentheses missing. \(d = \sqrt{(a(b))^{2} + (0c)^{2}} = \sqrt{(a+b)^{2}+(c)^{2}}\) That's what you had, it's just written with all the symbols int eh right places. Can we do nything else with it?
 one year ago

enya.goldBest ResponseYou've already chosen the best response.0
Eh, no, that's precisely what I had in mind! :)
 one year ago

tkhunnyBest ResponseYou've already chosen the best response.2
We might be able to do one more thing. Draw a perpendicular line from (b,c) down to the xaxis. You should see a right triangle. Can we say anything about the relationship of a, b, and c because of this right triangle?
 one year ago

enya.goldBest ResponseYou've already chosen the best response.0
dw:1357966403862:dw My drawing is not entirely accurate, but I only see a scalene triangle and equilateral triangle?
 one year ago

tkhunnyBest ResponseYou've already chosen the best response.2
No, no, that't not perpendicular to the xaxis. It should hit the xaxis at (b,0), not at (0,0). It is a vertical line segment.
 one year ago

enya.goldBest ResponseYou've already chosen the best response.0
dw:1357966687931:dw
 one year ago

tkhunnyBest ResponseYou've already chosen the best response.2
That's it. The one on the right is the one I was looking for. Anyway, my little right triangle leads to \((ab)^{2} + c^{2} = (ab)^{2} + (c)^{2}\) and we don't manage to learn anything, so let's just let that go. It can be very useful to poke around a little. In this case, we didn't learn much, but it was worth the effort to learn to communicate better. :)
 one year ago
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