what's the measurements for a dart board
Darts A regulation board is ​17 3⁄4 inches (451 mm) in diameter and is divided into 20 radial sections. Each section is separated with metal wire or a thin band of sheet metal.[5] The best dartboards have the thinnest wire, so that the darts have less chance of hitting a wire and bouncing out. The numbers indicating the various scoring sections of the board are also normally made of wire, especially on tournament-quality boards. The wire ring on which the numbers are welded can be turned to facilitate even wear of the board. Boards of lesser quality often have the numbers printed directly on the board.
Parthenon Measured at the stylobate, the dimensions of the base of the Parthenon are 69.5 by 30.9 metres (228 by 101 ft). The cella was 29.8 metres long by 19.2 metres wide (97.8 × 63.0 ft). On the exterior, the Doric columns measure 1.9 metres (6.2 ft) in diameter and are 10.4 metres (34 ft) high. The corner columns are slightly larger in diameter. The Parthenon had 46 outer columns and 23 inner columns in total, each column containing 20 flutes. (A flute is the concave shaft carved into the column form.) The roof was covered with large overlapping marble tiles known as imbrices and tegulae.[citation needed][54]