Tangents, Chords, and Secants -Circles
1,902 views · Published 17 September 2013 · 10:01 · Indexed 6 November 2026
Channel: MooMooMath and Science · 2013 · Education
The tangent of a circle is a straight line that intersects the circle at exactly one point, called the point of tangency. The tangent line is perpendicular to the radius of the circle at the point of tangency. In other words, the tangent of a circle is a line that touches the circle but does not cross it. A chord of a circle is a straight line segment that connects two points on the circle. A chord is not necessarily a diameter of the circle, which is the longest possible chord that passes through the center of the circle. The secant of a circle is a straight line that intersects the circle at two distinct points. The secant line is not perpendicular to the radius of the circle at either point of intersection. In other words, the secant of a circle is a line that crosses the circle at two points. The length of the secant segment is the distance between the two points of intersection. Video Guide :30 Lengths of the tangents explained 1:23 Rules for two tangents drawn to a circle 2:11 Finding the perimeter of a triangle using tangents of a circle 2:35 Formula for chords explained 3:20 Application problem using the formula for chords 4:30 Formula for secants ( The product of the lengths of the secant segment and it's external segment is equal to the product of the lengths of the second secant segment and its external segment 4:53 Formula for secants explained
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