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Elements of Geometry Containing Books I. to VI. and Portions of Books XI ...
James Hamblin Smith
Volledige weergave - 1876
ABCD base bisected Book called centre chord circle circumference coincide common construction described diagonals diameter difference distance divided double draw drawn equal equiangular equimultiples Eucl Euclid extremities fall figure formed four given point given straight line greater half Hence inscribed intersect isosceles triangle join less Let ABC magnitudes measure meet method middle points multiple NOTE opposite sides parallel parallelogram pass perpendicular plane PROBLEM produced Prop proportional PROPOSITION prove Q. E. D. Ex quadrilateral ratio rect rectangle contained regular respectively right angles segment shew shewn sides similar Similarly square suppose Take taken tangent THEOREM third touch triangle triangle ABC twice vertex vertical whole
Pagina 49 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Pagina 176 - The angle in a semicircle is a right angle; the angle in a segment greater than a semicircle is less than a right angle; and the angle in a segment less than a semicircle is greater than a right angle.
Pagina 44 - IF a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another; and the exterior angle equal to the interior and opposite upon...
Pagina 48 - If a side of any triangle be produced, the exterior angle is equal to the two interior and opposite angles; and the three interior angles of every triangle are together equal to two right angles.
Pagina 102 - To draw a straight line through a given point parallel to a given straight line. Let A be the given point, and BC the given straight line ; it is required to draw a straight line through the point A, parallel to the straight hue BC.
Pagina 185 - To describe an isosceles triangle, having each of the angles at the base double of the third angle.
Pagina 87 - In every triangle, the square on the side subtending either of the acute angles, is less than the squares on the sides containing that angle, by twice the rectangle contained by either of these sides, and the straight line intercepted between the acute angle and the perpendicular let fall upon it from the opposite angle, Let ABC be any triangle, and the angle at B one of its acute angles, and upon BC, one of the sides containing it, let fall the perpendicular AD from the opposite angle.
Pagina 3 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.