Primary Elements of Plane and Solid Geometry: For Schools and Academies |
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Page 13
... SIDES . The point from which they diverge is called the VERTEX . Thus , AB and BC are the sides , and B the vertex of the angle ABC . B A In reading angles by three letters , the one at the vertex should always occupy the middle place ...
... SIDES . The point from which they diverge is called the VERTEX . Thus , AB and BC are the sides , and B the vertex of the angle ABC . B A In reading angles by three letters , the one at the vertex should always occupy the middle place ...
Page 14
... side of it , are together equal to two right angles . Let the straight line DC meet the straight line AB in C. Then will the two angles ACD , DCB , be together equal to two right angles . A- D -B For , if DC be perpendicular to AB ...
... side of it , are together equal to two right angles . Let the straight line DC meet the straight line AB in C. Then will the two angles ACD , DCB , be together equal to two right angles . A- D -B For , if DC be perpendicular to AB ...
Page 15
... side , are together equal to two right angles . Cor . 1. In a similar manner , whatever be the num- ber of adjacent angles formed at C , on one side of AB , it may be shown that their sum is two right angles . Cor . 2. A right angle is ...
... side , are together equal to two right angles . Cor . 1. In a similar manner , whatever be the num- ber of adjacent angles formed at C , on one side of AB , it may be shown that their sum is two right angles . Cor . 2. A right angle is ...
Page 16
... takes some other direction , as mGn , the cor- responding inner and outer angles will be unequal ; also , the alternate angles . Cor . 2. If two angles have their sides parallel , each to each , and directed the same way from 16 GEOMETRY .
... takes some other direction , as mGn , the cor- responding inner and outer angles will be unequal ; also , the alternate angles . Cor . 2. If two angles have their sides parallel , each to each , and directed the same way from 16 GEOMETRY .
Page 17
... side will be equal to two right angles . Let EF intersect the two parallels AB , CD , in G and Then will BGH and H. GHD be together equal to two right angles . For the sum of the an- gles GHC and GHD is two A- F E B G H -D right angles ...
... side will be equal to two right angles . Let EF intersect the two parallels AB , CD , in G and Then will BGH and H. GHD be together equal to two right angles . For the sum of the an- gles GHC and GHD is two A- F E B G H -D right angles ...
Other editions - View all
Primary Elements of Plane and Solid Geometry: For Schools and Academies E W (Evan Wilhelm) 1827-1874 Evans No preview available - 2021 |
Primary Elements of Plane and Solid Geometry: For Schools and Academies E. W. 1827-1874 Evans No preview available - 2016 |
Common terms and phrases
AB² ABCDEF allel alternate angles altitude angle BAC angles ABC apothegm base multiplied bisect called chord circle circumference cone consequently convex surface diagonals diameter divided draw Eclectic Reader equal Theo equal to half equivalent frustum Geometry given point half the arc half the product Hence hypotenuse included angle inscribed angle intersect isosceles triangle Let ABCD let fall McGuffey's measured by half mutually equiangular mutually equilateral number of equal number of sides opposite parallelogram perimeter perpendicular perpendicular distance prism proportion proved Published by W. B. quadrilateral radii radius Ray's rectangle regular inscribed regular polygon regular pyramid right angles right parallelopiped right-angled triangle Schol semicircle side BC slant hight solidity square straight line SUPT tangent THEOREM trapezoid triangles ABC triangles are equal triangular vertex W. B. SMITH
Popular passages
Page 69 - If from a point without a circle, a tangent and a secant be drawn, the tangent will be a mean proportional between the secant and its external segment.
Page 42 - The circumference of every circle is supposed to' be divided into 360 equal parts, called degrees ; each degree into 60 minutes, and each minute into 60 seconds. Degrees, minutes, and seconds are designated by the characters °, ', ". Thus 23° 14' 35" is read 23 degrees, 14 minutes, and 35 seconds.
Page 21 - 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.
Page 47 - It follows, then, that the area of a circle is equal to half the product of its circumference and its radius.
Page 72 - The areas of two circles are to each other as the squares of their radii. For, if S and S' denote the areas, and R and R
Page 33 - The square described on the hypothenuse of a right-angled triangle is equivalent to the sum of the squares described on the other two sides.
Page 38 - The area of a regular polygon is equal to half the product of its apothem and perimeter.
Page 52 - PROBLEM VII. Two angles of a triangle being given, to find the third angle. The three angles of every triangle are together equal to two right angles (Prop.
Page 30 - The area of a rectangle is equal to the product of its base and altitude.
Page 69 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz. either the sides adjacent to the equal...