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ABCD axis base Book centre circle coincide common completely corners corresponding cuboid definition determined diameter dihedral angle direct line discussion distance divided drawn edges Edition Elementary Elements equal faces figures finite fixed four Further Geometry given line given point greater height Hence infinite intersection least length less limit lines joining measured meet moved normal O(ABC opposable opposite pair parallel planes parallelepiped passing perpendicular placed plane geometry pole polygon polyhedra polyhedron position postulate prism projection proof properties propositions proved pyramid quadrant ratio regular relations respect right angles senses sides similar solid angles space sphere spherical surface spherical triangle straight line superposable supplementary symmetrical with respect symmetry taken termed tetrahedron THEOREM third triangle ABC triangular trihedral true units vertex volume
Page 130 - ... equal, then the angles opposite to the other pair of equal sides are either equal or supplementary, and in the former case the triangles are identically equal.