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Comment on Triangles with Intersection
Hi Brent, can we conclude
Thanks for these videos, they are a great help!
You are correct; AB and CD are parallel, because we're told that ∠ABC = ∠BCD
Could you explain me in a different way from the OG17 Solution. Exercise #138 OG17.
You'll find my step-by-step solution here: https://gmatclub.com/forum/figures-x-and-y-above-show-how-eight-identica...
Hi Brent, Can we consider
∠BAD and ∠CDA aren't
∠BAD and ∠CDA aren't vertically opposite.
∠AEB and ∠CED are vertically opposite.
More here: https://www.gmatprepnow.com/module/gmat-geometry/video/858 (the part about vertically opposite angles starts at 4:20 in the video)
hey brent, how do u know
As long as your ratios on each side have the same structure, EITHER equation works.
OPTION #1: We can have "(length of one side of BIG triangle)/(length of corresponding side of SMALL triangle) = (length of another side of BIG triangle)/(length of corresponding side of SMALL triangle)
In this case, we get: 12/5 = 10/x
When we solve this, we get: x = 25/6
OPTION #2: We can have "(length of one side of SMALL triangle)/(length of corresponding side of BIG triangle) = (length of another side of SMALL triangle)/(length of corresponding side of BIG triangle)
In this case, we get: 5/12 = x/10
When we solve this, we still get: x = 25/6
Does that help?
perfect! thanks a lot!
not able to solve this one
sir is this gmat level question?
Here's my solution: https:/
Here's my solution: https://gmatclub.com/forum/in-triangle-abc-d-is-the-mid-point-of-bc-and-...
This is a crazy hard question. As I mention in my post, I'd say "skirting the 800 level of difficulty!"
In the case of congruent
I'm not sure whether you
I'm not sure whether you meant to say CONGRUENT or SIMILAR.
That said, there are many different ways for the test-maker to create two triangles that are similar (and congruent). Using parallel lines (as in the above video question) is just one of the ways.
Hi Brent, since we can derive
If you can mentally move and
If you can mentally move and flip a triangle so that the two triangles look more similar, then that will definitely help.
Could you pls solve this question: https://gmatclub.com/forum/in-triangle-abc-above-if-ad-bc-what-is-the-value-of-x-347007.html
This is a great question!
This is a great question!
Here's my solution: https://gmatclub.com/forum/in-triangle-abc-above-if-ad-bc-what-is-the-va...