Скачать или смотреть Proof: Angle between a tangent and a chord | Geometry (TX TEKS) | Khan Academy

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Let's prove that the measure of the angle formed by the intersection of a tangent and a chord is half the measure of the intercepted arc. We'll construct an isosceles triangle and use the relationship between radii and tangents of a circle to convince ourselves that this is true for both the major and minor arcs formed.

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