. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . ral triangle.—Figure area of an equilateral triangle is equal to the squareof one side multiplied by .433. To find the circumference of an equilateral triangle.—The circumference of an equilateral triangle is equal tothe sum of the length of the sides. Equilaterial triangle: Area= Circ. = 3D. To find the area of a right-angled or of an isosceles tri-angle.—Figure 61. Multiply the bas
. Sheet metal workers' manual; a complete, practical instruction book on the sheet metal industry, machinery and tools, and related subjects, including the oxy-acetylen welding and cutting process . ral triangle.—Figure area of an equilateral triangle is equal to the squareof one side multiplied by .433. To find the circumference of an equilateral triangle.—The circumference of an equilateral triangle is equal tothe sum of the length of the sides. Equilaterial triangle: Area= Circ. = 3D. To find the area of a right-angled or of an isosceles tri-angle.—Figure 61. Multiply the base by half the perpen-dicular height. To find the circumference of any regular polygon.—Figure 62. The circumference of any polygon is equal tothe sum of the length of the sides. No. ofsidesXDXPPolygon: Area == ~ —! Circ. = No. of sides X = Length of one = Perpendicular distance from the cen-ter to one side. MENSURATION OF VOLUME AND SURFACE OF SOLIDS To find the cubic contents of a sphere.—Figure 63,Multiply the cube of the diameter by .5236. To find the superficial area of a sphere.—Multiply thesquare of the diameter by PRACTICAL GEOMETRY AND MENSURATION 489. n i i i rii
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