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ABC and DEF ABCD adjacent angles altitude angle formed angles are equal angles compare apothem bisector bisects called chord circumference circumscribed compare in length cone of revolution Construct a square Construct a triangle Data diagonals diameter dihedral angles distance divide Draw equal circles equidistant equilateral triangle exterior extremities face angles FGHJK frustum given line given point given triangle Hence homologous sides hypotenuse intercepted interior angles intersecting isosceles triangle lateral edges measure middle point number of sides opposite sides parallel lines parallelogram pass a plane perimeter polyhedral angle polyhedron prism produced prove pyramid q.e.d. Proposition q.e.f. Proof quadrilateral radii radius ratio rect rectangle formed rectangular parallelopiped regular polygon respectively rhombus right angles right triangle secant segments slant height sphere spherical polygon spherical triangle subtended tangent tetrahedrons Theorem third side transversal trapezoid triangle ABC triangles are equal trihedral vertex vertical angle volume