math problem

[paperclippy]

If I have a quadrilateral, and I know the lengths of all four sides of it, can I calculate the interior angles? Especially if only one of the corners can be either concave or convex? It seems like I should be able to do this, when I look at the picture I drew, but I can't figure out how. If someone wants to help me and needs a little bit better of a visual aid, this is the idea: your right arm is on a table. I know how long your upper arm, forearm, and hand are, and I know where your shoulder is and where your hand is. I also know that your elbow doesn't bend backwards, but your hand might. I want to know the angle between your shoulder and your chest, between your upper arm and forearm, and between your hand and forearm.

If anyone is good at this stuff, please let me know!

Comments

[leech.livejournal.com]

There is room to wiggle things around and change angles, even while preserving convexity. Imagine a diamond with hinges at the corners; you can easily make it slightly taller or shorter without changing the side lengths.

[jwgh]

You'd need to know at least one angle.