Proof: Perpendicular to Radius is Tangent to Circle | Geometry

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If a line intersects a circle to be perpendicular to the radius at that point, then it is tangent to the circle, and so does not intersect the circle anywhere else. We prove this result in today's geometry video lesson. Recall that the converse is true as well. That is, if a line is tangent to a circle, then it is perpendicular to the radius at the point of tangency. We'll use a fun proof by contradiction for today's proof! #Geometry

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cq is r*sec(θ), cp is r. This is probably one of the coolest relationships in alegebra because it has the quadratic formula in it on the complex plane. And since it's on the complex plane, you can multiply the whole thing by n power to get an angle multiplication. It is where Fibonacci numbers and all those other recursive numbers come from.

thomasolson
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I found a gold video that explains clearly. Hey wish me luck i have a test tomorrow

LiberatedPilot
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Can you make a video on proving that if the sum of the opposite sides of a quadriliteral is the same then a circle could be inscribed inside it.

krasimirronkov