Aids to the mathematics of hygiene / [Robert Bruce Ferguson].

  • Ferguson, R. Bruce (Robert Bruce)
Date:
1904
Catalogue details

Licence: In copyright

Credit: Aids to the mathematics of hygiene / [Robert Bruce Ferguson]. Source: Wellcome Collection.

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    Superficial Area : Sectional area of a circle — r? (Px 3-1416 4~~ =d2 x 07854. 7uP 4 Square: lxb = l2. Rectangle: Ixb. Parallelogram: length of one side x perpendicular between that side and the one parallel to it. Triangle: * (base x height)— i.e., one - half the parallelogram on same base and of same height. Triangle (when length of sides only are given): let a, b, c be the sides, and let ^ {a-\-b + c)=s ; then area= fs(s—a)(s — b)(s -c). Ellipse: major axis x minor axis x 07854. Sphere: rd-^Agr1. Segment of circle: ^ Ch x h x “ j . Sides of cylinder: nrrh—i.e., circumference of base (circle) x height. Curved surface of cone: rrfp+h2, or - (circumference of base x leng th of slant side). Irregular figures bounded by straight lines: di- vide into triangles, and take the sum of their areas. Volume, Cubic Capacity, or Solid Contents : Cube=lxb x h—P. Rectangle — lx bxh.