What is a tangent line to a circle?
Tangent Lines and Chords of a Circle

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Mathematics
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10th - 12th Grade
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Easy
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1.
FLASHCARD QUESTION
Front
Back
A tangent line is a straight line that touches the circle at exactly one point, known as the point of tangency.
2.
FLASHCARD QUESTION
Front
What is the relationship between a tangent line and a radius at the point of tangency?
Back
The tangent line is perpendicular to the radius drawn to the point of tangency.
3.
FLASHCARD QUESTION
Front
What is a chord in a circle?
Back
A chord is a line segment whose endpoints lie on the circle.
4.
FLASHCARD QUESTION
Front
What is the diameter of a circle?
Back
The diameter is a chord that passes through the center of the circle and is the longest chord.
5.
FLASHCARD QUESTION
Front
How do you find the length of a chord given the radius and the distance from the center to the chord?
Back
Use the formula: length of chord = 2 * √(r² - d²), where r is the radius and d is the distance from the center to the chord.
6.
FLASHCARD QUESTION
Front
What does it mean for arcs to be congruent in a circle?
Back
Congruent arcs have the same measure and subtend congruent chords.
7.
FLASHCARD QUESTION
Front
If two chords are congruent, what can be said about their distances from the center of the circle?
Back
Congruent chords are equidistant from the center of the circle.
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