New High School Arithmetic, Academic, Industrial, Commercial
New High School Arithmetic, Academic, Industrial, Commercial
Webster Wells
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The perimeter of the base is 8 x 6 ft. or 48 ft. 2. .-. the lateral area = i x 10 x 48 = 240 sq. ft 134. A Frustum of a Pyramid is that part of a pyramid inclosed between the base and a plane parallel to the base. The base and the section of the plane parallel to the base are called the Bases of the frustum; the perpendicular be- tween the bases is called the Altitude of the frustum. The lateral faces are bounded by trapezoids. If the frustum is the frustum of a regular pyramid, the altitudes o...f the lateral faces are all equal, and their common length is called the slant height of the frus- tum ; as HH\ Note. — Only frustums of regular pyramids have a slant height. 192 . NEW HIGH SCHOOL ARITHMETIC The. line representing the slaiit height of a frustum of a regular pyramid joins the mid-points of the bases of the face on which it is drawn. 135. Finding the Lateral Area of a Frustum of a Regular Pyramid. — In the figure of § 134, the area of trapezoid ABB* A' is one half its altitude multiplied by the sum of its bases ; but this is one half the slant height of the frustum multiplied by the sum of one side of the lower base and one side of the upper base.
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