The normal elementary geometry : embracing a brief treatise on mensuration and trigonometry : designed for academies, seminaries, high schools, normal schools, and advanced classes in common schools (1884)
Brooks, Edward, 1831-1912 · Philadelphia : Christopher Sower Co. · leaf 138
ections parallel tothe bases at equal distances from the vertices are equal. Cor. 2. Any two sections parallel to the base are propor-tional to the squares of their distances from the vertex. THEOEEM XV. Two triangular pyramids having equivalent bases and equalaltitudes are equal in volume. Let S —…
Geometry · Plane trigonometry
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