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altitude angles adjoining angles are equal apothem base bisector bisects central angle chord circular cone circumference circumscribed construct a square cylinder diagonals diameter dihedral angles divided equilateral triangle exterior angle face angles figure Find the area Find the volume frustum given line given point given triangle Hence homologous homologous sides hypotenuse inscribed regular intersecting isosceles triangle lateral area lateral edges legs line joining locus of points mean proportional median meet midpoint mutually equiangular number of sides opposite parallel parallelepiped parallelogram Pass plane perimeter perpendicular plane MN polyhedron prism Prove quadrilateral ratio rectangle regular hexagon regular polygon regular pyramid rhombus right angles right circular right triangle secant segments similar slant height sphere spherical polygon spherical triangle straight line surface tangent tetrahedron Theorem total area trapezoid trihedral vertex vertices
Sivu 141 - If the product of two quantities is equal to the product of two others, one pair may be made the extremes, and the other pair the means, of a proportion.
Sivu 42 - The measure of an exterior angle of a triangle is equal to the sum of the measures of the two remote interior angles.
Sivu 148 - If a line divides two sides of a triangle proportionally, it is parallel to the third side.
Sivu 79 - A circle is a plane figure bounded by a curved line, every point of which is equally distant from a point within called the center.
Sivu 230 - An equiangular polygon inscribed in a circle is regular (if the number of its sides is odd) . 3.
Sivu 43 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.
Sivu 49 - The line joining the mid-points of two sides of a triangle is parallel to the third side, and equal to half the third side.
Sivu 14 - The straight lines are called the sides of the triangle, and their points of intersection are the vertices of the triangle.