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  2. Tangent lines to circles - Wikipedia

    en.wikipedia.org/wiki/Tangent_lines_to_circles

    Let O 1 and O 2 be the centers of the two circles, C 1 and C 2 and let r 1 and r 2 be their radii, with r 1 > r 2; in other words, circle C 1 is defined as the larger of the two circles. Two different methods may be used to construct the external and internal tangent lines.

  3. Circle packing theorem - Wikipedia

    en.wikipedia.org/wiki/Circle_packing_theorem

    A circle packing for a five-vertex planar graph. The circle packing theorem (also known as the Koebe–Andreev–Thurston theorem) describes the possible tangency relations between circles in the plane whose interiors are disjoint. A circle packing is a connected collection of circles (in general, on any Riemann surface) whose interiors are ...

  4. Problem of Apollonius - Wikipedia

    en.wikipedia.org/wiki/Problem_of_Apollonius

    Inversion in a circle centered on P transforms the two given circles into new circles, and the solution circle into a line. Therefore, the transformed solution is a line that is tangent to the two transformed given circles. There are four such solution lines, which may be constructed from the external and internal homothetic centers of the two ...

  5. Law of sines - Wikipedia

    en.wikipedia.org/wiki/Law_of_sines

    In trigonometry, the law of sines, sine law, sine formula, or sine rule is an equation relating the lengths of the sides of any triangle to the sines of its angles. According to the law, ⁡ = ⁡ = ⁡ =, where a, b, and c are the lengths of the sides of a triangle, and α, β, and γ are the opposite angles (see figure 2), while R is the radius of the triangle's circumcircle.

  6. No. 9 Alabama outlasts No. 6 Houston 85-80 in overtime at ...

    www.aol.com/no-9-alabama-outlasts-no-042326629.html

    Mark Sears scored 24 points and No. 9 Alabama beat No. 6 Houston 85-80 in overtime on Tuesday night in the opener of the Players Era Festival. After squandering an eight-point lead with 8:53 left ...

  7. Cops finally solve 1988 murder of teen found naked by a river ...

    www.aol.com/news/cops-finally-solve-1988-murder...

    Tracy Whitney was killed in August 1988 in Washington state.Cops have finally solved the murder of an 18-year-old woman found naked on a riverbed in Washington state more than 30...

  8. What are angel numbers? A guide to the numeric sequences and ...

    www.aol.com/angel-numbers-guide-numeric...

    Head to our Just Curious section to see what else we can answer. This article originally appeared on USA TODAY: Angel numbers: A beginner's guide to what they mean and more. Show comments.

  9. Annulus (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Annulus_(mathematics)

    An annulus Illustration of Mamikon's visual calculus method showing that the areas of two annuli with the same chord length are the same regardless of inner and outer radii. [ 1 ] In mathematics , an annulus ( pl. : annuli or annuluses ) is the region between two concentric circles.