Elements of Plane Geometry: For the Use of Schools
Lewis & Sampson, 1844 - Geometry, Plane - 96 pages
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Elements of Plane Geometry: For the Use of Schools - Primary Source Edition
No preview available - 2013
Common terms and phrases
ABCD acute added altitude angle ABC antecedent applied base bisect BOOK called centre chord circle circumference circumscribed coincide consequently contained cutting describe diagonal diameter difference distances divided double draw equal angles equal B. I. Prop equal Prop equiangular equivalent extremities feet figure formed four given angle given line given point greater half hence hypotenuse inches included angle inscribed angle join larger length less longer mean meet middle multiplied number of sides opposite parallel parallelogram perimeter perpendicular polygon PROBLEM proportion prove radii radius ratio rectangle remainder respectively equal right angles right-angled triangle Scholium sides similar square straight line subtended suppose surface taken tangent THEOREM third triangles ABC unit vertex yards
Page 31 - A circle is a plane figure bounded by a curved line, every point of which is equally distant from a point within called the center.
Page 63 - 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 71 - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. A D A' Hyp. In triangles ABC and A'B'C', To prove AABC A A'B'C' A'B' x A'C ' Proof. Draw the altitudes BD and B'D'.
Page 53 - In any proportion, the product of the means is equal to the product of the extremes.
Page 89 - 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 54 - In a series of equal ratios, any antecedent is to its consequent, as the sum of all the antecedents is to the sum of all the consequents. Let a: 6 = c: d = e :/. Then, by Art.
Page 83 - 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 59 - The area of a parallelogram is equal to the product of its base and its height: A = bx h.
Page 16 - Conversely, if two angles of a triangle are equal, the sides opposite them are also equal, and the triangle is isosceles.
Page 61 - From this proposition it is evident, that the square described on the difference of two lines is equivalent to the sum of the squares described on the lines respectively, minus twice the rectangle contained by the lines.