Of Cones Or Pyramids
Description
This section is from the book "A Practical Workshop Companion For Tin, Sheet Iron, And Copper Plate Workers", by Leroy J. Blinn. Also available from Amazon: A Practical Workshop Companion For Tin, Sheet Iron, And Copper Plate Workers.
Of Cones Or Pyramids
To Find The Convex Surface Of A Right Cone Or Pyramid
Rule. - Multiply the perimeter circumference of the base by the slant height, and half the product is the slant surface if the surface of the entire figure is required, and the area of the base to the convex surface.
Example. - The base of a Cone, fig. 13, is 5 ft., diameter and the slant height is 7 feet, what is the convex surface ?
15.70X7
5 X 3.1416 = 15.70 circumference of the base and -------------= 54.95
2 square feet the convex surface.
To Find The Convex Surface Of A Frustrum Of A Cone Or Pyramid
Rule. - Multiply the sum of the circumference of the two ends by the slant height, and half the product will be the slant surface.
The diameter of the top of a Frustom of a Cone, fig. 14, is 3 ft., the base 5 ft., the slant height 7 ft. 3 inches, required the slant surface.
25.12 X 7.25 9.42 + 15.7 = ---------------- = 91.06 square ft., the slant surface.
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