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Problem 357

The angle formed by two tangents drawn to a circle from the same external point measures \(80^{\circ}\). Find the measure of the minor intercepted arc.

Expert verified

The measure of the minor intercepted arc of the tangents drawn to a circle from the same external point is \(160^{\circ}\).

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Chapter 19

Given: \odotP is externally tangent to \(\odot \mathrm{Q}\) at T; DTC (that is, \(\mathrm{D}, \mathrm{T}\), and \(\mathrm{C}\) are collinear \() ; \mathrm{D}\) is a point of \(\odot \mathrm{P} ; \mathrm{C}\) is a point of QQ; \(\mathrm{T}\) is the point of intersection of \(\odot \mathrm{Q}\) and $\odot \mathrm{P} . \underline{\mathrm{ACE}}\( is tangent to \)\mathrm{OQ}\( at \)\mathrm{C} ; \underline{\mathrm{BDF}}\( is tangent \)\odot \mathrm{P}\( at \)\mathrm{D} .$ Let points \(\mathrm{A}\) and \(\mathrm{B}\) be the intersection of the tangents with the common internal tangent of \(\odot \mathrm{P}\) and \(\odot \mathrm{Q}\). Prove: \(\underline{A C E} \| \underline{B D F}\)

Chapter 19

If perpendiculars from the ends of a diameter of any circle are drawn to a tangent of that circle, prove that the sum of the lengths of the perpendiculars is equal to the length of the diameter.

Chapter 19

\(\underline{E B A}\) and \(\underline{E G D}\) are secants of \(\odot P\). Chords \(\underline{A F}\) intersects \(\underline{E G D}\) at point \(G\). If $E B=5, B A=7, E C=4, G D=3\(, and \)A G\( \)=6\(, find \)\mathrm{GF}$

Chapter 19

Two secant lines of the same circle share an endpoint in the exterior of the circle. Show that the product of the lengths of one secant segment and its external segment equal the product of the lengths of the other secant segment and its external segment.

Chapter 19

Line segment \(\underline{\mathrm{CD}}\) is the diameter of circle \(\mathrm{O}\), as seen in the diagram, and \(\underline{A D}\) is tangent to the same circle. Given that \(\underline{A B C}\) is a straight line, prove that $\triangle A B D\( and \)\Delta D B C$ are mutually equiangular.

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