 | André Darré - 1872 - 226 sider
...quadrilateral in which the sum of two opposite angles is 180°. 23. When a quadrilateral is described about a circle the sum of one pair of opposite sides is equal to the sum of the other pair. SECTION III. PROPORTIONAL LINES. 76. WHEN a line AB (Fig. 67) has been added to itself several times... | |
 | Isaac Todhunter - 1874 - 354 sider
...Article 254. Here s = 7, °-a=4, sb=4, sc=3, sd=3. Thus the area=^/^x"4 x 3 x 3 = 12. Since the sum of a pair of opposite sides is equal to the sum of the other pair, a circle may be inscribed in the quadrilateral. Let p denote the radins of this inscribed circle ;... | |
 | George Albert Wentworth - 1879 - 196 sider
...Ex. 281. If the diagonals of a quadrilateral cut each other at right angles, the sum of the squares of one pair of opposite sides is equal to the sum of the squares of the other pair. Ex. 282. In a rhombus the sum of the squares of the two diagonals is equal... | |
 | Great Britain. Civil Service Commission - 1880 - 670 sider
...the line which touches the circle. Prove that if a quadrilateral be described about a circle, then the sum of one pair of opposite sides is equal to the sum of the other pair. (a.) CHEMISTRY. (NB — Of the seven subjects a, b, c, d, e,f, g, two are obligatory.) Time allowed,... | |
 | Julius Petersen - 1880 - 86 sider
...quadrilateral the diagonals are at right angles to each other. Prove that the sum of the squares on the one pair of opposite sides is equal to the sum of the squares on the other pair. 148. A circle passes through the centre C of another circle and touches... | |
 | Julius Petersen - 1880 - 104 sider
...quadrilateral the diagonals are at right angles to each other. Prove that the sum of the squares on the one pair of opposite sides is equal to the sum of the squares on the other pair. 148. A circle passes through the centre C of another circle and touches... | |
 | Simon Newcomb - 1881 - 418 sider
...J angle arc BD - \ angle arc CA. QED THEOREM XXIII. 249. If a quadrilateral ~be circumscribed about a circle, the sum of one pair of opposite sides is equal to the sum of the other pair. Hypothesis. ABCD, a quadrilateral touching a circle in the points P, Q, R, S. Conclusion. AB + CD =... | |
 | Samuel Constable - 1882 - 222 sider
...vertex to the base : construct it. 34. If a quadrilateral circumscribe a circle, prove that the sura of one pair of opposite sides is equal to the sum of the other pair. 35. Draw a straight line cutting two given circles, so that the intercepted chords shall each be of... | |
 | Association for the improvement of geometrical teaching - 1884 - 150 sider
...33. The diagonals of a quadrilateral intersect at right angles : shew that the sum of the squares on one pair of opposite sides is equal to the sum of the squares on the other pair. *34. ABC is an equilateral triangle and AD is perpendicular to BC : shew... | |
 | Mathematical association - 1884 - 146 sider
...33. The diagonals of a quadrilateral intersect at right angles : shew that the sum of the squares on one pair of opposite sides is equal to the sum of the squares on the other pair. *34- ABC is an equilateral triangle and AD is perpendicular to BC : shew... | |
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The diagonals of a quadrilateral intersect at right angles. Prove that the sum of the squares on one pair of opposite sides is equal to the sum of the squares on the other pair. 
