Clarify directions please?

Question

Can someone please help me with these directions? especially the 45 and 90 degree one.
To make the best (In my humble opinion!) paper airplane, just follow these simple steps. First, get a plain piece of new (or at least mostly new) paper. Printer paper will probably work just fine, as it has the right amount of durability and strength, but still is easy to fold.

Then, with this piece of paper, fold it once lengthwise, aligning the edges so it is folded perfectly in half. Smooth over any creases. Then, take the one of the corners of the plane, and fold it over, perfectly, splitting the 90 degree angle into a 45 degree angle. Fold this again on the other side, replicating what you did on the other side as well.

This step is very important, so make sure you don't miss this, and make sure you fold it correctly. It is basically done by just taking the corner, and folding it down to match the bottom line, then smoothing over any creases or rough spots with your hand as you fold.

Now, you'll repeat this two more times, on each side, being careful to keep it as evenly folded as possible. To do this, fold this area over again on one side, and on the other side. Fold it one last more time on each side. And smooth over any creases or rough spots in the paper.

Answer 1

Take a piece of paper, fold in half lenghtwise (got that?), open it flat and take the top left corner and fold it down so it meets the crease in the middle, do the same on the top right corner. You will have a 45 degree triangle on both side with a good sharp point in the center kind of like the roof on a house. Your next fold on each side will not be 45 degrees. Basically you want to have a nice straight line down the center of the paper... You can check some paper airplane sites if this doesn't help

Answer 2

This is for a paper airplane with a self-weighted nose.

Another hint, when it says to fold to the center line, actually stop just a hair short of the center fold, to allow for everything to fit when you finally fold it in two toward the end.

First you do a fold to establish the lengthwise center and unfold. Lightly mark the end that will become the tail on both sides of the paper, just to keep track of it the first few times you fold.

Then you fold the two corners from the "nose" end to make a point at that end.

Now, here's the troublesome part: "taking the corner, and folding it down to match the bottom line"
This is folding the nose point down to where the original corners have been folded. This gives extra weight and sturdiness to the nose.

Then you repeat the angled folds to make a new nose point. Then do additional angled folds at 1/2 the previous angle. Then fold along the original lengthwise crease, leaving only what had been the underside of the paper visible.

I don't know exactly what's happening after that. Either third angular folds on each side, toward the original fold or do a pair of folds parallel to the original lengthwise fold line. Either of these will result in a reasonable paper airplane. Unfold the final folds to form wings at 90º angle from the body. Toss gently. The tip is hard and concentrates the force of the throw.

Answer 3

a 90 degree angle is straight, like the letter L. A 45 degree angle is a slant, exactly halfway between the top of the L and the bottom of the L.