chords and secants are same as
secant mean - a line which passes the circle by cutting it at two distinct points
chord mean - it is a straight line segment whose endpoint both lie on the circle
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Secants are chords that go through a circle ONCE! Tangents are rays or segments with one point touching the border of a circle and nothing else.
The tangent secant angle is the angle between the tangent to a circle and the secant, when the latter is extended.
Sometimes
Neither secant nor tangent pass through the center of a circle. A secant passes through one point on the circle and the tangent passes through two points on a circle.
A secant line is a line that cuts a circle in two places.