Plane and Solid Geometry |
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Page 4
... four equal angles , each angle is called a right angle , as EOD , DOF , etc. A right angle is half a straight angle . 32. An acute angle is an angle less than a right angle , K as angle ΙΚΗ . 33. An obtuse angle is A ← E- B a 1 FIG . 9 ...
... four equal angles , each angle is called a right angle , as EOD , DOF , etc. A right angle is half a straight angle . 32. An acute angle is an angle less than a right angle , K as angle ΙΚΗ . 33. An obtuse angle is A ← E- B a 1 FIG . 9 ...
Page 6
... four lines meet in a point so that AOB 120 ° , and BOC = COD = DOA , find BOC . = 17. In Fig . 17 name four pairs of adjacent angles . 18. If two lines , AB and CD , intersect in O , making AOC 60 ° , find the other angles . = 19. In ...
... four lines meet in a point so that AOB 120 ° , and BOC = COD = DOA , find BOC . = 17. In Fig . 17 name four pairs of adjacent angles . 18. If two lines , AB and CD , intersect in O , making AOC 60 ° , find the other angles . = 19. In ...
Page 11
... four sides , a quadrilateral . TRIANGLES 62. A triangle having three unequal sides is a scalene tri- angle . An isosceles triangle has two of its sides equal . An equilateral triangle has its three sides equal . Scalene Equilateral ...
... four sides , a quadrilateral . TRIANGLES 62. A triangle having three unequal sides is a scalene tri- angle . An isosceles triangle has two of its sides equal . An equilateral triangle has its three sides equal . Scalene Equilateral ...
Page 14
... four triangles are formed , of which those opposite each other are equal . 73. REMARK . - The equality of lines and angles is usually proved by means of equal triangles . Ex . 36. If any point in the perpendicular bisector 14 PLANE ...
... four triangles are formed , of which those opposite each other are equal . 73. REMARK . - The equality of lines and angles is usually proved by means of equal triangles . Ex . 36. If any point in the perpendicular bisector 14 PLANE ...
Page 16
... four points , A , B , C , and D , in a straight line be joined to a point , E , without , then ( 1 ) ZABE > LACE , ( 2 ) LABE > △ CED , ( 3 ) LABE > < ADE . ( See diagram on next page . ) Ex . 44. If in quadrilateral ABCD the diagonals ...
... four points , A , B , C , and D , in a straight line be joined to a point , E , without , then ( 1 ) ZABE > LACE , ( 2 ) LABE > △ CED , ( 3 ) LABE > < ADE . ( See diagram on next page . ) Ex . 44. If in quadrilateral ABCD the diagonals ...
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Common terms and phrases
ABCD altitude angles are equal bisect bisector chord circumference circumscribed cone construct a triangle cylinder diagonals diagram for Prop diameter diedral angles divide draw drawn equiangular equiangular polygon equilateral triangle equivalent exterior angle face angles find a point Find the area Find the radius Find the volume frustum given circle given line given point given triangle Hence HINT homologous hypotenuse inches inscribed intersecting isosceles triangle joining the midpoints lateral area lateral edges line joining mean proportional median opposite sides parallel lines parallelogram parallelopiped perimeter perpendicular plane MN point equidistant polyedral angle polyedron PROPOSITION prove Proof quadrilateral radii ratio rectangle regular polygon respectively equal rhombus right angles right triangle SCHOLIUM segments sphere spherical polygon spherical triangle square straight angle straight line surface tangent THEOREM trapezoid triangle ABC triangle are equal triedral vertex
Popular passages
Page 148 - If two chords intersect within a circle, the product of the segments of one is equal to the product of the segments of the other.
Page 150 - If, from a point without a circle, a tangent and a secant be drawn, the tangent is the mean proportional between the secant and its external segment.
Page 180 - Two triangles having an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles.
Page 45 - If two triangles have two sides of one equal respectively to two sides of the other, but the included angle of the first triangle greater than the included angle of the second, then the third side of the first is greater than the third side of the second.
Page 337 - A spherical polygon is a portion of the surface of a sphere bounded by three or more arcs of great circles. The bounding arcs are the sides of the polygon ; the...
Page 305 - A cylinder is a solid bounded by a cylindrical surface and two parallel planes ; the bases of a cylinder are the parallel planes; and the lateral surface is the cylindrical surface.
Page 312 - The lateral areas, or the total areas, of similar cylinders of revolution are to each other as the squares of their altitudes, or as the squares of their radii ; and their volumes are to each other as the cubes of their altitudes, or as the cubes of their radii. Let S, S' denote the lateral areas, T, T...
Page 149 - If, from a point without a circle, two secants are drawn, the product of one secant and its external segment is equal to the product of the other and its external segment.
Page 328 - Every section of a sphere made by a plane is a circle.
Page 257 - If two intersecting planes are each perpendicular to a third plane, their intersection is perpendicular to that plane.