Theoretical Geometry: Based on the Various Geometry Books by Godfrey and SiddonsThe University Press, 1926 - 173 σελίδες |
Αναζήτηση στο βιβλίο
Αποτελέσματα 1 - 5 από τα 87.
Σελίδα xiv
... Triangle inscribed in circle . 99 Tangents and common tangents . 99 ... ABC , such that AB AC ' then HK is parallel to BC AB COR . 1. If = AH AC AK ... TRIANGLES 116 THEOREM 57. The ratio of the areas of similar triangles xiv CONTENTS.
... Triangle inscribed in circle . 99 Tangents and common tangents . 99 ... ABC , such that AB AC ' then HK is parallel to BC AB COR . 1. If = AH AC AK ... TRIANGLES 116 THEOREM 57. The ratio of the areas of similar triangles xiv CONTENTS.
Σελίδα xv
... triangles is equal to the ratio of the squares on corresponding sides COR . 1. If two As ABC , XYZ have only one angle B = one angle Y , ΔΑΒΕ BC . BA then = A XYZ YZ , YX ' PAGE 117 • 118 COR . 2. The ratio of the areas of similar ...
... triangles is equal to the ratio of the squares on corresponding sides COR . 1. If two As ABC , XYZ have only one angle B = one angle Y , ΔΑΒΕ BC . BA then = A XYZ YZ , YX ' PAGE 117 • 118 COR . 2. The ratio of the areas of similar ...
Σελίδα 2
... ABC is a triangle ) . Always state concisely what has to be proved . Method of attack . First look at the figure and see what given facts have been indicated there , think what other facts follow from them ; if possible , indicate them ...
... ABC is a triangle ) . Always state concisely what has to be proved . Method of attack . First look at the figure and see what given facts have been indicated there , think what other facts follow from them ; if possible , indicate them ...
Σελίδα 13
... ANGLE - SUM for TrianGLE AND POLYGON . THEOREM 8. The sum of the angles of a triangle is equal to two right angles . A X E Data To prove that Construction B X с Fig . 9 . ABC is a triangle . LA + LB + 4 BCA = 2 rt . 4 s . Produce BC to ...
... ANGLE - SUM for TrianGLE AND POLYGON . THEOREM 8. The sum of the angles of a triangle is equal to two right angles . A X E Data To prove that Construction B X с Fig . 9 . ABC is a triangle . LA + LB + 4 BCA = 2 rt . 4 s . Produce BC to ...
Σελίδα 15
... triangle ABC has B Fig . 12 . B = LC ; D , E are points in AB , AC such that DE is parallel to BC ; prove that LADE = LAED . Ex . 10. If a straight line is perpendicular to one of two parallel straight lines , it is also perpendicular ...
... triangle ABC has B Fig . 12 . B = LC ; D , E are points in AB , AC such that DE is parallel to BC ; prove that LADE = LAED . Ex . 10. If a straight line is perpendicular to one of two parallel straight lines , it is also perpendicular ...
Συχνά εμφανιζόμενοι όροι και φράσεις
AABC altitude base BC chord circle centre circle whose centre circles intersect circles touch circumcircle circumference common tangent concyclic concyclic points congruent Constr cut BC cyclic quadrilateral Data ABC diameter divided drawn parallel equal circles equiangular equidistant equilateral triangle equivalent triangles Euclid figure fixed point given circle given point given straight line given triangle hypotenuse internal bisector isosceles trapezium isosceles triangle LAOB LAPB length line drawn opposite sides parallel to BC parallelogram parallelogram ABCD perpendicular bisector Playfair's Axiom polygon produced to meet prove that Construction Pythagoras Q. E. D. COR quadrilateral ABCD radii of equal radius ratio rectangle contained rhombus right angles right-angled triangle segment Show side BC square subtends tangent tetrahedron THEOREM touch externally trapezium triangle ABC vertex
Δημοφιλή αποσπάσματα
Σελίδα 20 - 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.
Σελίδα 46 - 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.
Σελίδα 29 - If two triangles have one angle of the one equal to one angle of the other and the sides about these equal angles proportional, the triangles are similar.
Σελίδα vii - When a straight line cuts two other straight lines, if (i) a pair of alternate angles are equal, or (ii) a pair of corresponding angles are equal, or (iii) a pair of interior angles on the same side of the cutting line are together equal to two right angles, then the two straight lines are parallel ; and the converse.
Σελίδα 62 - If a straight line be divided into any two parts, the square on the whole line is equal to the squares on the two parts, together with twice the rectangle contained by the two parts.
Σελίδα 76 - A straight line, drawn from the centre of a circle to bisect a chord which is not a diameter, is at right angles to the chord ; conversely, the perpendicular to a chord from the centre bisects the chord. There is one circle, and one only, which passes through three given points not in a straight line. In equal circles (or, in the same circle) (i) if two...
Σελίδα xiv - If a straight line touch a circle, and from the point of contact a chord be drawn, the angles which this chord makes with the tangent are equal to the angles in the alternate segments.
Σελίδα 70 - A point moves so that the sum of the squares of its distances from the points (0, 0), (1, 0) is constant.
Σελίδα 59 - In a right-angled triangle the square on the side subtending the right angle is equal to the sum of the squares on the sides containing the right angle.
Σελίδα 92 - Angles in the same segment of a circle are equal; and. if the line joining two points subtends equal angles at two other points on the same side of it, the four points lie on a circle.