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arc, in geometry
(Encyclopedia) arc, in geometry, a curved line or any part of it; in particular, a portion of the circumference of a circle. The length s of an arc of a circle of radius r and subtending a central…circumpolar star
(Encyclopedia) circumpolar star, star whose diurnal circle lies completely above or completely below an observer's horizon. A star whose diurnal circle lies above the horizon never sets, even though…cone, in mathematics
(Encyclopedia) CE5 Cone cone or conical surface, in mathematics, surface generated by a moving line (the generator) that passes through a given fixed point (the vertex) and continually intersects…Niccoli, Niccolò de'
(Encyclopedia) Niccoli, Niccolò de'Niccoli, Niccolò de'nēk-kōlôˈ dā nēkˈkōlē [key], 1363–1437, Italian humanist. One of the distinguished Florentine scholars in Cosimo de' Medici's circle, he wrote…cylinder
(Encyclopedia) CE5 Cylinder cylinder, in mathematics, surface generated by a line moving parallel to a given fixed line and continually intersecting a given fixed curve called the directrix; each…Scharoun, Hans
(Encyclopedia) Scharoun, HansScharoun, Hanshäns shärˈoun [key], 1893–1972, German architect. A member of the expressionist circle, Scharoun used a dynamic, sculptural approach to design throughout…pi
(Encyclopedia) pi, in mathematics, the ratio of the circumference of a circle to its diameter. The symbol for pi is π. The ratio is the same for all circles and is approximately 3.1416. It is of…tundra
(Encyclopedia) tundratundratŭnˈdrə [key], treeless plains of N North America and N Eurasia, lying principally along the Arctic Circle, on the coasts and islands of the Arctic Ocean, and to the north…Ralph Waldo Emerson: Circles
CirclesNature centres into balls, And her proud ephemerals, Fast to surface and outside, Scan the profile of the sphere; Knew they what that signified, A new genesis were here.How to Find Area of a Circle
This video demonstrates how students can use what they know about the area of a parallelogram to find the area of a circle.Trending
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