I realized it was a 6-8-10 triangle because, first the hypotnuse given is 10, and we know that the height is 2 more than the base, so 6 (base) and 8 (height) fit perfectly.

The GMAT doesn't want to give us impossible questions to answer. The authors are as aware fo the time constraints as we are (well, maybe not quite as aware!).

Take the time to learn those \(3-4-5, 1-1-sqrt{2}, 1-sqrt{3}-2\) triangles because so often, the triangles on the exam will fit perfectly into one of these. It's not the knowledge of the triangles the GMAT really tests, its recognizing the significance of the data presented to you.

Also, realize that an equilateral trianle is made up of 2, 30-60-90 triangles. My percentages may be off a bit, but I would say geometry is 90% recognizing relationships and 10% doing the actual math!

quantum wrote:

Yes It is D!

But Can you explain please How did you quickly recognize that it is 3 4 5 triangle with sides multiplied by 2?

I picked B at first...

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J Allen Morris

**I'm pretty sure I'm right, but then again, I'm just a guy with his head up his a$$.

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