A Text-book of Geometrical DeductionsLongmans, Green and Company, 1891 - Geometry |
From inside the book
Results 1-5 of 45
Page 7
... Draw the diagonal AC . Use Euc . I. 8 to show that △ ABC = △ ADC 4. The diagonals of a rhombus bisect each other , and are at right angles to each other . Show , as in Ex ... lines drawn at right angles to the § 3. ] 7 Book I. - Theorems.
... Draw the diagonal AC . Use Euc . I. 8 to show that △ ABC = △ ADC 4. The diagonals of a rhombus bisect each other , and are at right angles to each other . Show , as in Ex ... lines drawn at right angles to the § 3. ] 7 Book I. - Theorems.
Page 8
... lines which meet in a point are said to be concurrent . Thus Ex . 6 shows that the straight lines drawn at right angles to the sides of a triangle from their mid - points are concurrent . 7. If the opposite sides of a quadrilateral be ...
... lines which meet in a point are said to be concurrent . Thus Ex . 6 shows that the straight lines drawn at right angles to the sides of a triangle from their mid - points are concurrent . 7. If the opposite sides of a quadrilateral be ...
Page 11
... drawn to the lines containing the angle , and each perpen- dicular be produced its own length , the extremities of the produced lines and the vertex of the right angle shall be in one straight line . Let ABC be the given rt . 4 . Use ...
... drawn to the lines containing the angle , and each perpen- dicular be produced its own length , the extremities of the produced lines and the vertex of the right angle shall be in one straight line . Let ABC be the given rt . 4 . Use ...
Page 12
... line drawn from any angular point of a triangle to the mid - point of the opposite side is less than half the sum of ... Lines, Complements and Supplements, Collinear Points, Median,
... line drawn from any angular point of a triangle to the mid - point of the opposite side is less than half the sum of ... Lines, Complements and Supplements, Collinear Points, Median,
Page 21
... lines drawn through the extremities of the base of an isosceles triangle , equally inclined to it and ter- minated by the sides , are equal . Use Euc . I. 26 . 11. If two triangles have the same base , and if the straight line which ...
... lines drawn through the extremities of the base of an isosceles triangle , equally inclined to it and ter- minated by the sides , are equal . Use Euc . I. 26 . 11. If two triangles have the same base , and if the straight line which ...
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A Text-Book of Geometrical Deductions: Book I. Corresponding to ..., Book 1 James Blaikie,W. Thomson No preview available - 2017 |
Common terms and phrases
26 to show 38 to show ABCD altitude angle equal angular points apply Euc bisect bisectors Bookwork centre Compare Ex Construct a right-angled Construct a triangle Construct an isosceles convex polygon diagonals Draw a straight drawn parallel equal angles equilateral triangle EUCLID exterior angles Find a point Find the locus fixed point given line given point given square given straight line given the base given triangle hypotenuse isosceles triangle joining the mid-points LADC Let ABC line which joins lines be drawn median meet BC method of Ex mid-point of BC obtuse opposite angles opposite sides parallel straight lines parallelogram perimeter point in BC previous Ex quadrilateral quadrilateral ABCD rectangle required to prove respectively equal rhombus right angles right-angled triangle satisfies the condition Standard Theorem straight line drawn trapezium triangle required Trisect vertex vertical angle
Popular passages
Page 81 - In every triangle, the square on the side subtending an acute angle is less than the sum of the squares on the sides containing that angle, by twice the rectangle contained by either of these sides, and the straight line intercepted between the perpendicular let fall on it from the opposite angle, and the acute angle.
Page 27 - If two triangles have two sides of the one equal to two sides of the...
Page 135 - PROB. from a given point to draw a straight line equal to a given straight line. Let A be the given point, and BC the given straight line : it is required to draw from the point A a straight line equal to BC.
Page 136 - If, at a point in a straight line, two other straight lines, upon the opposite sides of it, make the adjacent angles together equal to two right angles, these two straight lines shall be in one and the same straight line.
Page 138 - If the square described on one side of a triangle be equal to the sum of the squares described on the other two sides, the angle contained by these two sides is a right angle.
Page 81 - In obtuse-angled triangles, if a perpendicular be drawn from either of the acute angles to the opposite side produced, the square on the side subtending the obtuse angle is greater than the squares on the sides containing the obtuse angle, by twice the rectangle contained by the side...
Page 137 - THE straight lines which join the extremities of two equal and parallel straight lines, towards the same parts, are also themselves equal and parallel.
Page 50 - A line which joins the midpoints of two sides of a triangle is parallel to the third side and equal to half of it.
Page 137 - ... upon the same side together equal to two right angles; the two straight lines shall be parallel to one another.
Page 135 - The angles at the base of an isosceles triangle are equal to one another; and if the equal sides be produced the angles on the other side of the base shall be equal to one another.