Elements of Geometry: Containing the First Six Books of Euclid, with a Supplement on the Quadrature of the Circle, and the Geometry of Solids: to which are Added, Elements of Plane and Spherical Trigonometry |
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Page 10
... sides . 20. An isosceles triangle is that which has only two sides equal . AAA 21. A scalene triangle is that which has three unequal sides . 22. A right angled triangle is that which has a right angle . 23. An obtuse angled triangle is ...
... sides . 20. An isosceles triangle is that which has only two sides equal . AAA 21. A scalene triangle is that which has three unequal sides . 22. A right angled triangle is that which has a right angle . 23. An obtuse angled triangle is ...
Page 13
... sides of the one equal to two sides of the other , each to each ; and have likewise the angles contained by those sides equal to one another , their bases , or third sides , shall be equal ; and the areas of the triangles shall be equal ...
... sides of the one equal to two sides of the other , each to each ; and have likewise the angles contained by those sides equal to one another , their bases , or third sides , shall be equal ; and the areas of the triangles shall be equal ...
Page 14
... sides of the one equal to two sides of the other , each to each , and have likewise the angles con- tained by those sides equal to one another ; their bases shall be equal , and their areas shall be equal , and their other angles , to ...
... sides of the one equal to two sides of the other , each to each , and have likewise the angles con- tained by those sides equal to one another ; their bases shall be equal , and their areas shall be equal , and their other angles , to ...
Page 15
... side of the base . COROLLARY . Hence every equilateral triangle is also equiangular . PROP . VI . THEOR . If two angles of a triangle be equal to one another , the sides which subtend or are opposite to them , are also equal to one ...
... side of the base . COROLLARY . Hence every equilateral triangle is also equiangular . PROP . VI . THEOR . If two angles of a triangle be equal to one another , the sides which subtend or are opposite to them , are also equal to one ...
Page 16
... sides of the other , each to each , and have likewise their bases equal ; the angle which is contain- ed by the two sides of the one shall be equal to the angle contained by the two sides of the other . Let ABC , DEF be two triangles ...
... sides of the other , each to each , and have likewise their bases equal ; the angle which is contain- ed by the two sides of the one shall be equal to the angle contained by the two sides of the other . Let ABC , DEF be two triangles ...
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Common terms and phrases
ABC is equal ABCD adjacent angles altitude angle ABC angle ACB angle BAC base BC bisected centre chord circle ABC circumference cosine cylinder demonstrated described diameter divided draw equal and similar equal angles equiangular equilateral equilateral polygon equimultiples Euclid exterior angle fore four right angles given rectilineal given straight line greater Hence hypotenuse inscribed join less Let ABC Let the straight magnitudes meet multiple opposite angle parallel parallelogram parallelopiped perpendicular polygon prism PROB PROP proportional proposition quadrilateral radius ratio rectangle contained rectilineal figure remaining angle right angled triangle SCHOLIUM segment semicircle shewn side BC sine solid angle solid parallelopiped spherical angle spherical triangle square straight line BC THEOR touches the circle triangle ABC triangle DEF wherefore
Popular passages
Page 53 - If a straight line be divided into two equal parts, and also into two unequal parts; the rectangle contained by the unequal parts, together with the square of the line between the points of section, is equal to the square of half the line.
Page 18 - If two triangles have two sides of the one equal to two sides of the...
Page 54 - If a straight line be bisected, and produced to any point, the rectangle contained by the whole line thus produced, and the part of it produced, together with the square on half the line bisected, is equal to the square on the straight line which is made up of the half and the part produced.
Page 82 - 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.
Page 31 - Straight lines which are parallel to the same straight line are parallel to one another. Triangles and Rectilinear Figures. The sum of the angles of a triangle is equal to two right angles.
Page 11 - 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.
Page 21 - The angles which one straight line makes with another upon one side of it, are either two right angles, or are together equal to two right angles. Let the straight line AB make with CD, upon one side of it, the angles CBA, ABD : these shall either be two right angles, or shall together be equal to two right angles. For...
Page 101 - To describe an isosceles triangle, having each of the angles at the base double of the third angle.
Page 58 - AB into two parts, so that the rectangle contained by the whole line and one of the parts, shall be equal to the square on the other part.
Page 298 - 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.