An Elementary Treatise on Geometry: Simplified for Beginners Not Versed in Algebra. Part I, Containing Plane Geometry, with Its Application to the Solution of Problems, Part 1 |
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Page 13
... triangle is called isosceles , when two of its sides only are equal . A triangle is called scalene , when none of its sides are equal . A triangle is also called right - angled , when it contains a right angle ; and oblique - angled ...
... triangle is called isosceles , when two of its sides only are equal . A triangle is called scalene , when none of its sides are equal . A triangle is also called right - angled , when it contains a right angle ; and oblique - angled ...
Page 14
... right angle , in a right - angled triangle , is called the hypothenuse . A circle is a surface terminated on all sides by a curve line returning into itself , all points of which are at an equal distance from one and the same point ...
... right angle , in a right - angled triangle , is called the hypothenuse . A circle is a surface terminated on all sides by a curve line returning into itself , all points of which are at an equal distance from one and the same point ...
Page 17
... triangle has all its sides equal , what is it called ? When two of its sides only are equal , what ? When none of its sides are equal , what ? What is a triangle called , when it contains a right angle ? What , if it does not contain ...
... triangle has all its sides equal , what is it called ? When two of its sides only are equal , what ? When none of its sides are equal , what ? What is a triangle called , when it contains a right angle ? What , if it does not contain ...
Page 28
... triangle ORI is equal to the triangle OPF ? A. It shows that since the triangle OPF is right - an- gled in P , the triangle ORI must be right - angled in R ; for , in equal triangles , the equal angles are opposite to the equal sides ...
... triangle ORI is equal to the triangle OPF ? A. It shows that since the triangle OPF is right - an- gled in P , the triangle ORI must be right - angled in R ; for , in equal triangles , the equal angles are opposite to the equal sides ...
Page 34
... right angles ; and by add- ing it to the angle e alone , the sum of the two ... triangle are known , the third angle is also determined . 3. When two angles ... angled triangle , the right angle is equal to the sum of the two other angles ...
... right angles ; and by add- ing it to the angle e alone , the sum of the two ... triangle are known , the third angle is also determined . 3. When two angles ... angled triangle , the right angle is equal to the sum of the two other angles ...
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Common terms and phrases
adjacent angles angle ABC angle ACB angle x basis bisected called centre chord circle whose radius circum circumference circumscribed circles consequently degrees DEMON diagonal diameter dividing the product draw the lines equal angles equal sides equal triangles exterior angle feet figure ABCDEF found by multiplying fourth term geometrical proportion given angle given circle given straight line given triangle gles height hypothenuse inches isosceles triangle length let fall line AB line AC line CD line MN mean proportional measures half number of sides parallel lines parallelogram ABCD perpendicular points of division PROBLEM prove quadrilateral radii radius rectangle rectilinear figure regular polygon ABCDEF Remark rhombus right angles right-angled triangle second term Sect semicircle side AB side AC similar triangles smaller SOLUTION subtended tangent third line third term three angles three sides trapezoid triangle ABC triangles are equal Truth vertex
Popular passages
Page 2 - District Clerk's Office. BE IT REMEMBERED, that on the tenth day of August, AD 1829, in the fifty-fourth year of the Independence of the United States of America, JP Dabney, of the said district, has deposited in this office the title of a book, the right whereof he claims as author, in the words following, to wit...
Page 78 - If two triangles have two sides of the one equal to two sides of the other, each to each, but the...
Page 2 - CLERK'S OFFIcE. BE it remembered, that on the eleventh day of November, AD 1830, in the fiftyfifth year of the Independence of the United States of America, Gray & Bowen, of the said district, have deposited in this office the title of a book, the right whereof they claim as proprietors, in the words following, to wit...
Page 136 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds.
Page 121 - The perimeters of two regular polygons of the same number of sides, are to each other as their homologous sides, and their areas are to each other as the squares of those sides (Prop.
Page 137 - The side of a regular hexagon inscribed in a circle is equal to the radius of the circle.
Page 127 - The areas of two regular polygons of the same number of sides are to each other as the squares of their radii, or as the squares of their apothems.
Page 154 - A, with a radius equal to the sum of the radii of the given circles, describe a circle.
Page 90 - ... any two triangles are to each other as the products of their bases by their altitudes.
Page 137 - P is at the center of the circle. II. 18. The sum of the arcs subtending the vertical angles made by any two chords that intersect, is the same, as long as the angle of intersection is the same. 19. From a point without a circle two straight lines are drawn cutting the convex and concave circumferences, and also respectively parallel to two radii of the circle. Prove that the difference of the concave and convex arcs intercepted by the cutting lines, is equal to twice the arc intercepted by the radii.