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Thread: Help with Geometry Concept

  1. #1
    Trying to make mom and pop proud
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    Help with Geometry Concept

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    I do understand you can assume nothing from the diagrams. My question is on the principles.

    Here is the question which I've inserted in three photos
    part 1: https://docs.google.com/file/d/0B8G2...it?usp=sharing

    part 2: https://docs.google.com/file/d/0B8G2...it?usp=sharing

    part 3: https://docs.google.com/file/d/0B8G2...it?usp=sharing

    My answer would have easily been C - that m and n are equal (the answer is D). I didn't assume that based on the pic. I assumed that because line AD and DC are equal. I thought that equal-sized lines had equal-sized angles. I'm getting this from all the rules on triangles and angles. For instance here:


    Can anyone help me get this straight in my head? I feel like a lot of this stuff is just memorization, but I'd like to make valid connections.

  2. #2
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    It looks like this is from Princeton review, right?

    Actually C is trap answer here.

    Actually the opposite angles of equal sides of a triangle are equal.(mind it of a Single triangle)

    Here in the first case two sides are equal but that are from different triangle(AD from ADB triangle, DC from BDC triangle); so that formula will not work here.

    For the second case, both sides are from a single triangle. So, the formula works here!!!!!!!
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