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Tangent & Secant lines

1. Secant line: A secant is a line that intersects the circle in two different points .

2. Tangent line: A tangent is a line that intersects the circle in exactly one point, called the point of tang ency.

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In mathematics (and more specifically geometry), a semicircle is a one-dimensional locus of points that forms half of a circle. ... All lines intersecting the semicircle perpendicularly are concurrent at the center of the circle containing the given semicircle

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The Radius is the distance from the center outwards. The Diameter goes straight across the circle.

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A major arc is an arc larger than a semicircle. A central angle which is subtended by a major arc has a measure greater than 180°. A chord, a central angle or aninscribed angle may divide a circle into two arcs. The smaller of the two arcs is called the minor arc.

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circumference. The distance around a circle is called the circumference, and although circumference is often used when talking about round things, it can mean a boundary of any shape that completely surrounds something. It's no coincidence that the first part of circumference looks like circle.

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inscribed circumscribed polygons of a circle 

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inscribed circumscribed polygons of a circle 

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A circumscribed polygon is a polygon in which each side is a tangent to a circle. A lesson on polygons inscribed in and circumscribed about a circle. The circumcenter of a polygon is the center of a circle circumscribed about a polygon. ... If a quadrilateral isinscribed in a circle, its opposite angles are supplementary.

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A chord of a circle is a straight line segment whose endpoints both lie on the circle. A line segment connecting two points on a curve. Example: the line segment connecting two points on a circle's circumference is a chord. When the chordpasses through the center of a circle it is called the diameter.

A secant is a line that intersects a circle in exactly two points. When a tangent and a secant, two secants, or two tangents intersect outside a circle then the measure of the angle formed is one-half the positive difference of the measures of the intercepted arcs.

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are circles with a common center. The region between two concentric circles of different radii is called an annulus.
Tangent circles are circles in a common plane that intersect in a single point. There are two types of tangency: internal and external.

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The sector of the circle is shown in as you can see from the figure above, a sector is a pie-shaped part of a circle. The area of a sector can be expressed using its central angle or its arc length.
The segment of a circle is the region bounded by a chord and the arc subtended by the chord.

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central and inscribed angles of a circle.

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central and inscribed angles of a circle.

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An inscribed angle is an angle formed by two chords in a circle which have a common endpoint.
Central angles are angles formed by any two radii in a circle. The measure of the a central angle is equals to twice of an inscribed angle.

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In a plane, the interior of a circle is the set of points whose distance from the center is less than the radius. The exterior of a circle is the set of points in the plane whose distance from the center is greater than the radius.