## New Elementary Geometry: With Practical Applications ; a Shorter Course Upon the Basis of the Larger Work |

### From inside the book

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... proportion A : B :: C : D , D is the fourth proportional to A , B , and C. 98. When both the means are the same magnitude , either of them is called a

... proportion A : B :: C : D , D is the fourth proportional to A , B , and C. 98. When both the means are the same magnitude , either of them is called a

**mean proportional**between the extremes ; and if , in a series of proportional ... Page 38

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**mean proportional**between the other two . = Let AXC B2 ; then B is a**mean proportional**between A and C. For , dividing each member of the given equation by B × C , we have whence A = B B C ' A : B :: B : C. THEOREM IV . 107. If four ... Page 42

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**proportionals**, their like powers and roots will also be**proportional**. Let A B C : D ; then will A ” : A : B " :: C ...**mean**. 2. If four magnitudes are**proportionals**, the first and 42 ELEMENTARY GEOMETRY . Exercises for original ... Page 54

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**mean**we shall have the angle AC B : angle ACI :: arc AB : arc AI . Comparing these two proportions with each other , and observing that the antecedents are the same , we infer that the consequents are**proportional**...**proportion**is true , the ... Page 86

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**mean proportional**between the hypothenuse and the part of t it which is cut off adjacent to that side by the ... proportional ; hence BD : BA :: BA : BC ; and , the triangles D A C , B A C being also similar , DC : AC :: AC : BC ; hence ...### Other editions - View all

### Common terms and phrases

A B C D ABCD ABCDEF alti altitude altitude Theo angle A CD axis base multiplied bisect chord circumference circumscribed cone convex surface diagonal diameter divided Elementary Algebra ellipse entire surface equal Theo equivalent frustum greater GREENLEAF'S NEW MATHEMATICAL Greenleaf's New Series half the sum hence homologous homologous sides hypothenuse inches inscribed circle magnitudes MATHEMATICAL SERIES mean proportional measured by half number of sides parallelogram parallelopipedon Parker's Exercises perimeter perpendicular prism PROBLEM radii radius ratio rectangle rectangular regular polygon Required the area Required the volume rhombus right angles Theo rods Scholium School secant line side A B side B C similar slant hight solid sphere is equal spherical square described square feet THEOREM triangles A B C triangular triangular prism vertex zoid

### Popular passages

Page 23 - If two triangles have the three sides of the one equal to the three sides of the other, each to each, the triangles are congruent.

Page 29 - 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.

Page 83 - Two triangles, which have an angle of the one equal to an angle of the other, and the sides containing these angles proportional, are similar.

Page 85 - If in a right triangle a perpendicular is drawn from the vertex of the right angle to the hypotenuse : I.

Page 61 - At a point in a given straight line to make an angle equal to a given angle.

Page 57 - The angle formed by a tangent and a chord is measured by half the intercepted arc.

Page 62 - Through a given point to draw a straight line parallel to a given straight line, Let A be the given point, and BC the given straight line : it is required to draw through the point A a straight line parallel to BC.

Page 117 - If two angles not in the same plane have their sides parallel and lying in the same direction, these angles will be equal, and their planes will be parallel. Let...

Page 100 - The circumferences of circles are to each other as their radii, and their areas are to each other as the squares of their radii. Let C denote the circumference of one of ^ the circles, R its radius OA, A its area; and let C...

Page 88 - Similar polygons may be divided into the same number of triangles similar each to each, and similarly situated.