Area Calculator. Online Conversion - Convert just about anything to anything else. Free Online Math Calculator and Converter. Circle. A circle can be defined as the curve traced out by a point that moves so that its distance from a given point is constant. Terminology[edit] History[edit] Circular piece of silk with Mongol images The circle has been known since before the beginning of recorded history. Natural circles would have been observed, such as the Moon, Sun, and a short plant stalk blowing in the wind on sand, which forms a circle shape in the sand. The circle is the basis for the wheel, which, with related inventions such as gears, makes much of modern machinery possible. Early science, particularly geometry and astrology and astronomy, was connected to the divine for most medieval scholars, and many believed that there was something intrinsically "divine" or "perfect" that could be found in circles.[2][3] Some highlights in the history of the circle are: 1700 BCE – The Rhind papyrus gives a method to find the area of a circular field.
Analytic results[edit] Length of circumference[edit] Area enclosed[edit] . , since. Triangles. A plane triangle is an object having 3 straight sides in 2-dimensional space. (Triangles in other spaces, for example spherical triangles, are not treated here.) Triangles have 3 sides, 3 vertices (the points where the sides meet), and 3 angles. <p class="scriptwarn">The calculator below uses JavaScript, and so it will not work for you.
Your browser does not handle JavaScript, perhaps because it is a very old version, or maybe because you have disabled JavaScript. Triangle calculators If the sizes of three of the six parts (3 angles and 3 sides) of a triangle are known, and at least one of the known parts is a side, the sizes of the other sides and angles can be calculated. In what follows, the sides are named with lowercase letters, and the angle opposite a side is named by the same letter, but in uppercase. Equations about triangles For the equations below, the angles are named with the Greek letters alpha (α), beta (β) and gamma (γ). The Law of Sines The Cosine Law The Law of Tangents.