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Trapezoid (USA) - Trapezium (UK)
Definition of a trapezoid, bases, legs, median and angles of a trapezoid ...

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Area Of A Circle, Sector, Segment
Area of a circle is equal to pi times square of the radius.

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Perimeter Of A Circle And Arc Length
The perimeter of a circle is equal to two times pi times radius of the circle.

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Common Tangents OF Two Circles
A line that is tangent to two circles is called a common tangent of the circles. Common tangent is called external tangent if ...

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Cyclic Quadrilateral
A cyclic quadrilateral is a quadrilateral for which a circle can be circumscribed so that it touches each polygon vertex.

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Positions Of Two Circles In A Plane
Each circle is in the exterior region of the other. The distance between the centers of the circles are greater than the sum of their radii.

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Positions Of Line And Circle In Plane
There are three different positions of a line and a circle in a plane. 1. Line and circle don't have a common point. They don't intersect.

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