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Problem 370

\(\underline{E B A}\) 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}$

Expert verified

The length of GF is \(5\) units.

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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

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

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.

Chapter 19

Prove: Whether an angle that is exterior to the circle is formed by two secants to the circle, a secant and a tangent to the circle, or two tangents to the circle, the measure of the angle equals the difference in the measures of the intercepted arcs.

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: \(\underline{A C E} \| \underline{B D F}\)

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