 | Webster Wells, Walter Wilson Hart - Geometry - 1916 - 504 pages
...146. If the diagonals of a quadrilateral bisect each other, the figure is a parallelogram. Ex. 147. If from any point in the base of an isosceles triangle parallels to the equal sides be drawn, the perimeter of the parallelogram formed is equal to the sum of the equal sides... | |
 | Robert Remington Goff - 1922 - 136 pages
...of whose angles are right angles. 38. The bisectors of the angles of a rectangle form a square. 39. If from any point in the base of an isosceles triangle parallels to the equal sides are drawn, the perimeter of the parallelogram equals the sum of the equal sides of the... | |
 | William Weller Strader, Lawrence D. Rhoads - Geometry, Plane - 1927 - 434 pages
...41. If one angle of a parallelogram is a right angle, the other three angles are right angles. 42. If from any point in the base of an isosceles triangle, parallels to the legs are drawn, a parallelogram will be formed whose perimeter equals the sum of the legs. 43. If perpendiculars... | |
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If from any point in the base of an isosceles triangle parallels to the equal sides be drawn, show that a parallelogram is formed whose perimeter is equal to the sum of the equal sides of the triangle. 
