ELEMENTS OF GEOMETRY AND TRIGONOMETRY; WITH PRACTICAL APPLICATIONS.

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Pàgina 19 - In an isosceles triangle, the angles opposite the equal sides are equal.
Pàgina 59 - 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.
Pàgina 172 - If two planes are perpendicular to each other, a straight line drawn in one of them, perpendicular to their common section, will be perpendicular to the other plane.
Pàgina 103 - If two triangles have two angles of the one equal to two angles of the other, each to each, and also one side of the one equal to the corresponding side of the other, the triangles are congruent.
Pàgina 215 - A SPHERICAL TRIANGLE is a portion of the surface of a sphere bounded by three arcs of great circles, each arc being less than a semi-circumference ; as AE D.
Pàgina 23 - Any side of a triangle is less than the sum of the other two sides...
Pàgina 37 - 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.
Pàgina 120 - At a point in a given straight line to make an angle equal to a given angle.
Pàgina 254 - To find the area of a PARALLELOGRAM. Multiply the base by the altitude, and the product will be the area (Prop.
Pàgina 94 - In any quadrilateral the sum of the squares of the sides is equivalent to the sum of the squares of the diagonals, plus four times the square of the straight line that joins the middle points of the diagonals.

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