Apollonius <Pergaeus>; Lawson, John, The two books of Apollonius Pergaeus, concerning tangencies, as they have been restored by Franciscus Vieta and Marinus Ghetaldus : with a supplement to which is now added, a second supplement, being Mons. Fermat's Treatise on spherical tangencies

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          <head xml:id="echoid-head110" xml:space="preserve">AN
            <lb/>
          EXPLANATION
            <lb/>
          OF THE
            <lb/>
          SYMBOLS made uſe of in this SYNOPSIS.</head>
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          H. # repreſents the Hypothenuſe of a right-angled triangle.
            <lb/>
          V. # Vertical angle.
            <lb/>
          B. # Baſe or ſide oppoſite V.
            <lb/>
          P. # Perpendicular from V on B.
            <lb/>
          S&s. # Sides about V; S the greater, s the leſs.
            <lb/>
          A & a. # Angles at B; A the greater, a the leſs.
            <lb/>
          m & n. # Segments of B by P; m the greater, n the leſs.
            <lb/>
          Ar. # Area.
            <lb/>
          Per. # Perimeter.
            <lb/>
          L. # Line from V to B, biſecting V.
            <lb/>
          λ. # Line from V to B, cutting B in a given ratio.
            <lb/>
          l. # Any other line ſpecified how drawn.
            <lb/>
          R. # Radius of inſcribed circle.
            <lb/>
          ☉(sun). # Circle.
            <lb/>
          ◻. # Square.
            <lb/>
          : # Ratio: thus, S: s ſignifies the ratio of the ſides.
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