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## #1 Help Me ! » Triangle inscribed in a semicircle » 2013-07-09 12:06:47

romani
Replies: 1

Okay, so I've found this geometry question that's making me crazy (because I'm really weak in geometry, sighs)
Could you help me? c:
The question is as it follows:

take the segment AB with a lenght 6. Consider a semicircle with AB as the diameter. Let P be a point on the arc AB. Let x = <ABP.
1) express the area of the triangle ABP in terms of X.
2) find the range of x for which the are of the triangle

3) if the point P is so chosen that PA + PB =
holds, find the area of the triangle ABP.

I don't know how to find the area in terms of X, but with this area found, I think I can manage the other questions.
Thank you c:

## #2 Re: Help Me ! » quintic equation and constants » 2013-06-29 03:02:33

Oh, of course! I was making a really stupid mistake.
Sorry for bothering you with such a silly question!
Thank you very much for helping me! c:

## #3 Help Me ! » quintic equation and constants » 2013-06-28 05:51:45

romani
Replies: 4

hello! so, I've came accross a problem I can't solve at all :c. The problem is as it follows:

The constant term of

is equal -270, then a=?

I searched how to solve it and found only one solution, but I didn't understand what was done... they turned

into
and somehow found that k = 2. also, they found "
", which give us a = -3.

That's actually the right answer, but I can't figure out what was done to solve this problem... :c Can you guys explain it to me?

Thanks c: