Elements of Geometry: With Notes |
From inside the book
Results 1-5 of 22
Page 3
... isosceles triangle is one , which has two equal sides . 15. An equilateral triangle is one which has all its sides equal . 16. When no two sides are equal the triangle is called scalene . A 17. A right angled triangle is one which has a ...
... isosceles triangle is one , which has two equal sides . 15. An equilateral triangle is one which has all its sides equal . 16. When no two sides are equal the triangle is called scalene . A 17. A right angled triangle is one which has a ...
Page 4
... isosceles triangle , to confine this term to that side which is not equal to either of the others . 19. A rhomboid or parallelogram is a quad- rilateral whose opposite sides are parallel . 20. If only two of the opposite sides are ...
... isosceles triangle , to confine this term to that side which is not equal to either of the others . 19. A rhomboid or parallelogram is a quad- rilateral whose opposite sides are parallel . 20. If only two of the opposite sides are ...
Page 11
... isosceles or equilateral . PROPOSITION IX . THEOREM . The angles opposite the equal sides of an isosceles triangle are equal . Let the sides AB , AC , of the triangle ABC be equal , then will the angle C be equal to the angle B. For ...
... isosceles or equilateral . PROPOSITION IX . THEOREM . The angles opposite the equal sides of an isosceles triangle are equal . Let the sides AB , AC , of the triangle ABC be equal , then will the angle C be equal to the angle B. For ...
Page 16
... isosceles triangle be produced beyond the vertex , the exterior angle will be double of either angle at the base , and if the base be produced , the ex- terior angle will exceed the interior adjacent angle . Cor . 8. From a point ...
... isosceles triangle be produced beyond the vertex , the exterior angle will be double of either angle at the base , and if the base be produced , the ex- terior angle will exceed the interior adjacent angle . Cor . 8. From a point ...
Page 20
... isosceles , as we have just shown , the exterior angle PDC is greater than the inward ad- jacent angle PDE ( Prop . XVI . Cor . 7. ) , and this last is greater than the angle PCD ( Prop . XVI . ) ; therefore PDC being greater than PCD ...
... isosceles , as we have just shown , the exterior angle PDC is greater than the inward ad- jacent angle PDE ( Prop . XVI . Cor . 7. ) , and this last is greater than the angle PCD ( Prop . XVI . ) ; therefore PDC being greater than PCD ...
Other editions - View all
Common terms and phrases
adjacent angles altitude angle ABC angle ACB angle BAC antecedent base centre chord circ circle circumference circumscribed polygon coincide consequently Prop construction Converse of Prop corollary demonstration described diagonals diameter divided draw equal angles equal Prop equal to AC equimultiples equivalent Euclid exterior angle follows four right angles geometry given straight line gonal greater half hence homologous sides hypothenuse hypothesis included angle inscribed angle inscribed polygon intersect isosceles triangle join Legendre less line drawn lines be drawn magnitudes meet multiple number of sides obtuse opposite angles parallel perimeter perpendicular PROBLEM proportion PROPOSITION XII quadrilateral radii rectangle rectangle contained regular polygon respectively equal rhomboid right angled triangle Scholium side BC similar polygons similar triangles submultiple subtended surface tangent THEOREM three angles tiple triangle ABC vertex VIII
Popular passages
Page 165 - ... if a straight line, &c. QED PROPOSITION 29. — Theorem. If a straight line fall upon two parallel straight lines, it makes the alternate angles equal to one another ; and the exterior angle equal to the interior and opposite upon the same side ; and likewise the two interior angles upon the same side together equal to two right angles.
Page 172 - If a straight line meet two straight lines, so as to make the two interior angles on the same side of it taken together less than two right angles...
Page 30 - If there be two straight lines, one of which is divided into any number of parts, the rectangle contained by the two straight lines is equal to the rectangles contained by the undivided line, and the several parts of the divided line. Let...
Page 185 - FBC ; and because the two sides AB, BD are equal to the two FB, BC, each to each, and the angle DBA equal to the angle FBC; therefore the base AD is equal (i.
Page 86 - IF a straight line be drawn parallel to one of the sides of a triangle, it shall cut the other sides, or those produced, proportionally; and if the sides, or the sides produced, be cut proportionally, the straight line which joins the points of section shall be parallel to the remaining side of the triangle...
Page 142 - To describe an isosceles triangle, having each of the angles at the base double of the third angle.
Page 205 - Let AMB be the enveloped line; then will it be less than the line APDB which envelopes it. We have already said that by the term convex line we understand a line, polygonal, or curve, or partly curve and . partly polygonal, such that a straight line cannot cut it in more than two points.
Page 185 - BK, it is demonstrated that the parallelogram CL is equal to the square HC. Therefore the whole square BDEC is equal to the two squares GB, HC ; and the square BDEC is described upon the straight line BC, and the squares GB, HC upon BA, AC.
Page 105 - And since a radius drawn to the point of contact is perpendicular to the tangent, it follows that the angle included by two tangents, drawn from the same point, is bisected by a line drawn from the centre of the circle to that point ; for this line forms the hypotenuse common to two equal right angled triangles. PROP. XXXVII. THEOR. If from a point without a circle there be drawn two straight lines, one of which cuts the circle, and the other meets it ; if the rectangle...
Page 35 - 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.