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Square. In Euclidean geometry, a square is a regular quadrilateral, which means that it has four sides of equal length and four equal angles (90- degree angles, π/2 radian angles, or right angles ). It can also be defined as a rectangle with two equal-length adjacent sides.
The rectangular field of play used for American football games measures 100 yards (91.44 m) long between the goal lines, and 160 feet (48.8 m) (53.3 yards) wide. The field may be made of grass or artificial turf. In addition, there are end zones extending another 10 yards (9.144 m) past the goal lines to the "end lines", for a total length of ...
A city block, residential block, urban block, or simply block is a central element of urban planning and urban design . In a city with a grid system, the block is the smallest group of buildings that is surrounded by streets. City blocks are the space for buildings within the street pattern of a city, and form the basic unit of a city's urban ...
The "circle" or "fielding circle" is an oval described by drawing a semicircle of 30 yards (27 m) radius from the centre of each wicket with respect to the breadth of the pitch and joining them with lines parallel, 30 yards (27 m) to the length of the pitch. This divides the field into an infield and outfield and can be marked by a painted line ...
The net posts are 3 ft (0.914 m) outside the doubles court on each side or, for a singles net, 3 ft (0.914 m) outside the singles court on each side. Based on the standard rules of tennis, the size of the court is measured to the outside of the respective baselines and sidelines. The "service" lines ("T" and the "service" line) are centered.
Perimeter. Perimeter is the distance around a two dimensional shape, a measurement of the distance around something; the length of the boundary. A perimeter is a closed path that encompasses, surrounds, or outlines either a two dimensional shape or a one-dimensional length. The perimeter of a circle or an ellipse is called its circumference .
The length of the internal bisector of the angle opposite the side of length a is [ 1] In a right triangle, the radius of the excircle on the hypotenuse equals the semiperimeter. The semiperimeter is the sum of the inradius and twice the circumradius. The area of the right triangle is where a, b are the legs.
According to the United States Census Bureau, the city has a geographical area of 68.3 square miles (176.9 km 2 ), 61.4 square miles (159.0 km 2) of which is land, and the remaining 6.9 square miles (17.9 km 2) (10.16%) of which is water. The Anacostia River and the smaller Rock Creek flow into the Potomac River in Washington.