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A line that intersects a circle in exactly one point is called a tangent.

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The distance around a circle on the other hand is called the circumference.

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PARTS OF A CIRCLES

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The diameter is the length of the line through the center that touches two points on the edge of the circle.

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The radius of a circle is the length of the line from the center to any point on its edge.

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A sector of a circle is the portion of a circle enclosed by two radii and an arc.

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A chord of a circle is a straight line segment whose endpoints both lie on the circle.