Elements of Geometry, Theoretical and Practical: Including Constructions of the Right Line and by the Circle; Together with the Mensuration of All Elementary Plane Figures and Solids

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J. Whetham, 1836 - 220 σελίδες
 

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Δημοφιλή αποσπάσματα

Σελίδα 33 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.
Σελίδα 17 - If two triangles have two sides, and the included angle of the one equal to two sides and the included angle of the other, each to each, the two triangles are equal in all respects.
Σελίδα 20 - If two triangles have two sides of the one respectively equal to two sides of the other, and the contained angles supplemental, the two triangles are equal.
Σελίδα 213 - The surface of a sphere is equal to four times the area of a circle...
Σελίδα 10 - If a straight line fall on two parallel straight lines, it makes the alternate angles equal to one another, and the exterior angle equal to the interior and opposite angle on the same side; and also the two interior angles on the same side together equal to two right angles.
Σελίδα 99 - THE square of the side of a regular pentagon inscribed in a circle, is equal to the squares of the sides of a regular hexagon and regular decagon, inscribed in the same circle.
Σελίδα 26 - To describe a square that shall be equal to a given rectilineal figure. To describe an isosceles triangle having each of the angles at the base double of the third angle. To inscribe a regular pentagon in a given circle. The squares on two sides of a triangle are together equal to twice the square on half the third side and twice the square on the median to that side. If...
Σελίδα 73 - THEOREM. The opposite angles of any quadrilateral figure inscribed in a circle, are together equal to two right angles. Let ABCD be a quadrilateral figure in the circle ABCD.
Σελίδα 76 - THE rectangle contained by the diagonals of a quadrilateral inscribed in a circle, is equal to both the rectangles contained by its opposite sides.* Let ABCD be any quadrilateral inscribed in a circle, and join AC, BD ; the.
Σελίδα 185 - ... be cut by a plane parallel to the base, the section is a figure parallel and similar to the base. The one point a...

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