Converters & Calculators

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Circles (Circumference & Area)


Important Notes
  • Centre of the circle is the point equidistant from all points on the circle. Radius is the line segment joining the centre of a circle with any single point on the circle itself or the length of such a segment which is half (the length of) a diameter.
  • Circumference is the length of one circuit along the circle or the distance around the circle and Area of a circle is the region occupied by the circle in a two-dimensional plane.
  • The ratio of a circle's circumference to its diameter is π (pi), an irrational constant approximately equal to 3.141592654. Thus the circumference C is related to the radius r and diameter d by : C=2πr=πd.
  • Area of a circle can be determined by the formula, A=πr2, where r is the radius of the circle.
  • Specifically, a circle is a simple closed curve that divides the plane into two regions: an interior and an exterior. In everyday use, the term "circle" may be used interchangeably to refer to either the boundary of the figure or to the whole figure including its interior; in strict technical usage, the circle is only the boundary and the whole figure is called a disc.
circles
Circles

A circle is a shape consisting of all points in a plane that are a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves in a plane so that its distance from a given point is constant. The distance between any point of the circle and the centre is called the radius.
A circle may also be defined as a special kind of ellipse in which the two foci are coincident and the eccentricity is 0 or the two-dimensional shape enclosing the most areas per unit perimeter squared using the calculus of variations. Also, circles are useful in many applications.

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Triangles
Triangles (Perimeter & Area)

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. In Euclidean geometry, any three points when non-collinear, determine a unique triangle and simultaneously, a unique plane (i.e. a two-dimensional Euclidean space). In other words, there is only one plane that . . . .

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Area
Area Converter & Calculator

Area is the quantity that expresses the extent of a two-dimensional figure or shape or planar lamina, in the plane. Area can be understood as the amount of material with a given thickness that would be necessary to fashion a model of the shape or the amount of paint necessary to cover the surface with a single . . . .

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Rectangles
Rectangles (Perimeter & Area)

The word rectangle comes from the Latin rectangulus, which is a combination of rectus (as an adjective, right, straight) and angulus (angle). A Rectangle is a four sided-quadrilateral having all the internal angles to be right-angled (90°). It can also be defined as an equiangular quadrilateral, since equiangular means that all of . . . .

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Color
Color Picker

Color or colour is the characteristic of visual perception described through color categories with names such as red, orange, yellow, green, blue or purple. Web colors are colors used in displaying web pages on the World Wide Web and the methods for describing and specifying those colors. Colors may be specified as an RGB . . . .

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Volume
Volume Converter & Calculator

Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains. Volume is often quantified numerically using the SI derived unit, the cubic meter. The volume of a container is generally understood . . . .

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The use of units, measurements and conversions plays a big part in excelling in math. The intent of this site is to help visitors perform different varieties of calculations/conversions easily with a high degree of accuracy.

The site includes unit converters for various quantities like currency, length, speed, time, area, volume, mass, temperature, angle, pressure, energy and power. In addition to this, it provides area & volume calculations of different shapes & it's parts. The site also contains several other features like number system conversion, calculation of interests, percentages along with color code finder and many more.

History of Measurement :

The earliest recorded systems of calculations and measures originate in the 3rd or 4th millennium BC. Even the very earliest civilizations needed measurement for purposes of agriculture, construction and trade. Early standard units might only have applied to a single community or small region, with every area developing its own standards for lengths, areas, volumes and masses.

With the development of manufacturing technologies and the growing importance of trade between communities and ultimately across the Earth, standardized weights and measures became critical. Starting in the 18th century, modernized, simplified and uniform systems of weights and measures were developed, with the fundamental units defined by ever more precise methods in the science of metrology.

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