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Compass (drawing tool) A compass, also commonly known as a pair of compasses, is a technical drawing instrument that can be used for inscribing circles or arcs. As dividers, it can also be used as a tool to mark out distances, in particular, on maps. Compasses can be used for mathematics, drafting, navigation and other purposes.
A math circle is an extracurricular activity intended to enrich students' understanding of mathematics. The concept of math circle came into being in the erstwhile USSR and Bulgaria, around 1907, with the very successful mission to "discover future mathematicians and scientists and to train them from the earliest possible age". [1]
The area of a regular polygon is half its perimeter multiplied by the distance from its center to its sides, and because the sequence tends to a circle, the corresponding formula–that the area is half the circumference times the radius–namely, A = 1 2 × 2πr × r, holds for a circle.
C = 2πR. A circle is a shape consisting of all points in a plane that are at a given distance from a given point, the centre. The distance between any point of the circle and the centre is called the radius. The length of a line segment connecting two points on the circle and passing through the centre is called the diameter.
Circle that passes through the vertices of a triangle. In geometry, the circumscribed circle or circumcircle of a triangle is a circle that passes through all three vertices. The center of this circle is called the circumcenter of the triangle, and its radius is called the circumradius. The circumcenter is the point of intersection between the ...
In mathematics, a Ford circle is a circle in the Euclidean plane, in a family of circles that are all tangent to the -axis at rational points. For each rational number , expressed in lowest terms, there is a Ford circle whose center is at the point and whose radius is . It is tangent to the -axis at its bottom point, .
[[Category:Fraction templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Fraction templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
large circle: u+25ef 〇: ideographic number zero: u+3007 O: fullwidth latin capital letter o: u+ff2f ⃝: combining enclosing circle: u+20dd ⭕: heavy large circle: u+2b55 ⚫: medium black circle: u+26ab 🔴: large red circle: u+1f534 o: latin capital letter o: u+004f 🔵: large blue circle: u+1f535 ⊕: circled plus: u+2295 ⊖: circled ...
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