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Lesson: Geometry Challenging - 03

Definitions Of Tangent Line, Chord, Circumference, And Arc

[Page 3 of 32]

A straight line that is tangent to a circle could be extended infinitely in either direction and would still touch the circle at only one point. A right angle is formed by the tangent line and the point's corresponding radius.

The circumference is the distance around a circle.

An arc is a portion of the circumference. An arc's length can be measured in units, or in degrees. An arc encompassing the shorter section of the circumference between points is called a minor arc and the one encompassing the longer section is called a major arc.

A chord is a straight line from one point on the circumference to another point on the circumference. It may or may not pass through the center (in other words, diameters are chords, but chords are not necessarily diameters).

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