Plane Geometry

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Scott, Foresman, 1915 - Geometry, Plane - 277 pages
 

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Page 75 - The straight line joining the middle points of two sides of a triangle is parallel to the third side, and equal to half of it.
Page 169 - In any triangle, the square of a side opposite an acute angle is equal to the sum of the squares of the other two sides diminished by twice the product of one of those sides and the projection of the other side upon it.
Page 165 - The square described on the hypotenuse of a right triangle is equivalent to the sum of the squares on the other two sides.
Page 155 - The area of a parallelogram is equal to the product of its base and its height: A = bx h.
Page 164 - Two triangles which have an angle of one equal to the supplement of an angle of the other are to each other as the products of the sides including the supplementary angles.
Page 250 - But this is impossible for it has been proved in higher mathematics that the ratio of the circumference to the diameter of a circle is transcendental.
Page 39 - In an isosceles triangle the angles opposite the equal sides are equal.
Page 94 - ... the third side of the first is greater than the third side of the second.
Page 164 - ... they have an angle of one equal to an angle of the other and the including sides are proportional; (c) their sides are respectively proportional.
Page 108 - Theorem. In the same circle or in equal circles, equal chords are equidistant from the center; and of two unequal chords the greater is nearer the center. Given two equal © M, M ' , with chords AB = A'B', AE > A'B', and OC, OD, O'C' ±'s from center 0 to AB, AE, and from center O

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