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ABC and A'B'C acute angle altitude angle formed base bisectors bisects called central angle chord circle circumference circumscribed congruent construct Corollary corresponding cube cylinder diagonal diameter dihedral angle distance divide Draw drawn equiangular equilateral triangle EXERCISES figure Find the area frustum Geometry given line given point HINT hypotenuse inches inscribed interior angles intersection isosceles triangle lateral area lateral edges length locus lune measured middle point number of sides Outline of Proof parallel lines parallelepiped parallelogram perimeter perpendicular plane MN polygon ABCDE polyhedral angle polyhedron prism proportional protractor prove quadrilateral radii radius ratio rectangle regular polygon respectively rhombus right angles right triangle ruler and compasses secant segment similar slant height sphere spherical polygon spherical triangle square straight line subtends surface tangent tetrahedron Theorem VII trapezoid triangle ABC triangular prisms trihedral vertex vertices volume
Page 160 - The area of a rectangle is equal to the product of its base and altitude ; that is, A = ab. 443. Corollary 1. The area of a square is equal to the square of its side. 444. Corollary 2. Tiro rectangles are to each other as the products of their bases and altitudes.
Page 132 - Sines that the bisector of an angle of a triangle divides the opposite side into parts proportional to the adjacent sides.
Page 125 - If the product of two numbers is equal to the product of two other numbers, either two may be made the means, and the other two the extremes of a proportion.
Page 301 - The sum of the angles of a spherical triangle is greater than two and less than six right angles ; that is, greater than 180° and less than 540°. (gr). If A'B'C' is the polar triangle of ABC...
Page 64 - If two triangles have two sides of the one equal to two sides of the...
Page 286 - The axis of a circle of a sphere is the diameter of the sphere which is perpendicular to the plane of the circle. The ends of the axis are called the poles of the circle.
Page 222 - Theorem. —A line perpendicular to one of two parallel lines is perpendicular to the other.
Page 310 - The area of a lune is to the area of the surface of the sphere as the angle of the lune is to four right angles.