A Practical Application of the Principles of Geometry to the Mensuration of Supe
A Practical Application of the Principles of Geometry to the Mensuration of Supe
Jeremiah Day
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Cor. 62 MENSURATION OF THE CONE. 2. If the axis of an oblique cone be 738, and make an angle of 30° with the plane of the base ; and if the circum- ference of the base be 355, what is the solidity ? Ans. 1233536. Problem V.. To find the convex surface of a frustum of a right cone. 67. Multiply half the slant-height by the sum of THE peripheries OF THE TWO ENDS. This is the rule for a frustum of a pyramid ; (Art. 51. ) and is equally applicable to a frustum of a cone, if a cone be considered as ...a pyramid of an infinite number of sides. (Art. 63. ) Or thus, Let the sector ABV represent the convex surface of a right cone, (Art. 65. ) andyDCV the surface of a portion of the cone, cat off by a plane parallel to the base. Then will ABCD be tbe surface of the frustum. Let AB=a, DC=6, YI>=d, AD=h. '^ Then the area ABV =iaX{h-\-d)=iah+iad. (Art. 34. ) And the area 'DCY=^bd. Subtracting the one from the other. The area ABDC=iaA+iac/ — ^bd. But d : d-\-h :\h : a. (Sup. Euc. 8. 1. )* Therefore ^ad^ ibd=ibh.
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