Seven Foot, Nine and A Quarter Inches - 7' 9.25''

Steel Tip: 7 feet 9 1/4 inches, Soft Tip: 8 feet 0 inches.  To mark the throw line a simple piece of tape will suffice.  Major tournaments, however, use a "hockey" which is a thin raised strip of wood approximately 1 1/2 inches high (see image diagram below).

There are 20 wedges, each divided into 4 sections for a total of 80 segments, plus the two in the middle for a grand total of 82 scoring areas.

The standard ones are 20 inches by 20 inches, and most are designed to fold in half.

There have been special editions and variations with slightly different board sizes.

It is the 3/8" section at the outer edge of the 4 wedge.

It is just the most common design. You can buy other types.

dart paper plane is made the same way as Arrow plane with only difference being folding of the paper along it's width so to make shorter plane with the wings pointing in the rear

You have sort of answered your own question there. To end a game of darts you must end on a double, the red bull or "bullseye" is actually a double - so you may finish on this. The green bull is known as single bull.

three triple-20's

The location is the venue. The venue is almost always a bar/pub for league darts, but many local darts associations hold annual tournaments in hotel ballrooms.

In the standard game the line, behind which the player should stand is 2.37 m(7 ft 9¼) for steel tip, soft tip is 8 feet even. This is the standard, recognized by the World Darts Federation.

I know some people who paid hundreds of dollars for their darts. I think you can get a decent set of 80% tungsten darts for around US$40. If you're just starting to throw and not sure you want to spend so much at this point, you have the option of starting with brass darts. They're quite a bit thicker that tungsten darts, but they're a lot cheaper, too.

Do not lean so far forward that you are off balance. Stand with your whole arm between you and the board, with your elbow pointed at the floor or pointed at the molding between the floor and the wall. It might help to stand sideways at the oche in order to force your elbow down. Hold the dart in a way that feels natural, but make sure you have enough contact with the dart to give it direction. Aim, then throw the dart into the target with a steady fluid motion, and follow through with a slight flick of the wrist as you release. DO NOT MOVE YOUR BODY as you throw the dart.

A 9 dart finish is a perfect game of darts. It is getting down from 501 to 0 in 9 darts.

It can be done in a number of ways, some are quite creative and basically it depends which double the player prefers to finsh on. The most popular way is

treble 20, treble 20, treble 20

treble 20, treble 20, treble 20

treble 20, treble 19 and double 12.

Phil Taylor is a popular professional dart player from England. Phil has hit ten 9 darters in his career. The tenth was hit at a televised match in 2014.

Her name is Emily Moore and she's from Bournemouth.

They all vary

It is one of the top 100 pastimes.

You cannot really say who the best is because it cannot be proven. For all we know there could be somebody out there averaging 120 every game he plays and just never played competitively. The Current PDC (Professional Darts Coperation) world number one is Phil "The Power" Taylor. He is a 15 Time World Champion and has won every televised tournament since June 2009 except the BDO (British Darts Organisation) Tournaments. He is considered to be the greatest of all time by most Darts fans.