10 5 Tangents
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10-5 Tangents
• tangent: a line that intersects exactly one point on a circle
Z
• If a radius is drawn to the tangent point, then the tangent line is perpendicular to the radius.
Y Z
And if a line is perpendicular to a radius of a circle at its endpoint on the circle, then you KNOW the line is a tangent ! DUH !
Y Z
If two segments from the same outside point are tangent, then they are congruent. X W
Y
How far is point Y from point X ?
Pythagorean Theorem… X
Y 6
8
Z
• That’s it!
TANGENT !!!
• tangent: a line that intersects exactly one point on a circle
Z
• If a radius is drawn to the tangent point, then the tangent line is perpendicular to the radius.
Y Z
And if a line is perpendicular to a radius of a circle at its endpoint on the circle, then you KNOW the line is a tangent ! DUH !
Y Z
If two segments from the same outside point are tangent, then they are congruent. X W
Y
How far is point Y from point X ?
Pythagorean Theorem… X
Y 6
8
Z
• That’s it!
TANGENT !!!
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