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Khan Academy (English - US curriculum)
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Khan Academy (English - US curriculum)
Math by grade
High school
High school geometry
Circles
Properties of tangents
Properties of tangents
Explore, prove, and apply properties of circles that involve tangents.
Proof: Radius is perpendicular to tangent line
Proof: Segments tangent to circle from outside point are congruent
Tangents of circles problem (example 1)
Tangents of circles problem (example 2)
Tangents of circles problem (example 3)
Tangents of circles problems