The Elements of Plane Geometry ...W.S. Sonnenschein and Company, 1884 |
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Página 17
... two right angles ; or , a right angle is half a straight angle . DEF . II . A perpendicular to a straight line is a straight line that makes a right angle with it . C DEF . 12. An acute angle is that which is ANGLES AT A POINT . 17.
... two right angles ; or , a right angle is half a straight angle . DEF . II . A perpendicular to a straight line is a straight line that makes a right angle with it . C DEF . 12. An acute angle is that which is ANGLES AT A POINT . 17.
Página 20
... equal . COR . 2. All right angles are equal to one another . For every right angle is half a straight angle , and the halves of equals are equal . Def . 10 . Ax . h . Cancel Matter Inserted . ] COR . 3. At a ANGLES AT A POINT . 20α.
... equal . COR . 2. All right angles are equal to one another . For every right angle is half a straight angle , and the halves of equals are equal . Def . 10 . Ax . h . Cancel Matter Inserted . ] COR . 3. At a ANGLES AT A POINT . 20α.
Página 36
... half the sum Use the construction of of the remaining sides . Theor . 9 . Ex . 19. If O is a point within the triangle ABC , shew that the sum of OA , OB , and OC is greater than half the perimeter of the triangle . Ex . 20. The ...
... half the sum Use the construction of of the remaining sides . Theor . 9 . Ex . 19. If O is a point within the triangle ABC , shew that the sum of OA , OB , and OC is greater than half the perimeter of the triangle . Ex . 20. The ...
Página 67
... half the base . Ex . 60. If a quadrilateral be formed by joining the middle points of the sides of a given quadrilateral , it is a parallelogram . EXERCISES . 61. Prove that the angle between the bisectors F 2 PARALLELS . 67.
... half the base . Ex . 60. If a quadrilateral be formed by joining the middle points of the sides of a given quadrilateral , it is a parallelogram . EXERCISES . 61. Prove that the angle between the bisectors F 2 PARALLELS . 67.
Página 68
... half the sum of the two remaining angles . 62. If the sides of a regular pentagon be produced to meet , the angles formed by these lines are together equal to two right angles . 63. If a straight line parallel to BC , the base of an ...
... half the sum of the two remaining angles . 62. If the sides of a regular pentagon be produced to meet , the angles formed by these lines are together equal to two right angles . 63. If a straight line parallel to BC , the base of an ...
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Términos y frases comunes
AB is equal ABCD AC is equal adjacent angles adjoining sides alternate angle angle ABC angle ACB angle AFG angle BAC angle CAB angle DEF angle EDF angle FGD angles are equal angles equal BA and AC base BC bisectors bisects centre circle cutting Constr construct a triangle contrapositive diagonal equal angles equal to AC exterior angle find the locus Geometry given angle given point given straight line greater Hence hypotenuse identically equal interior opposite angle isosceles triangle less Let ABC meet middle point obtuse angle opposite sides parallel straight lines parallelogram perpendicular point equidistant Prob produced quadrilateral radius rectangle contained rectangle whose base right angles right-angled triangle shew side AB side AC side DF sides equal square on AC squares on AB straight angle straight line drawn Theorem trapezium triangle ABC triangle DEF triangles are identically twice the rectangle vertex
Pasajes populares
Página 27 - If two triangles have two angles of the one equal to two angles of the other, each to each, and one side equal to one side, viz.
Página 70 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Página 56 - ... is equal to twice as many right angles as the polygon
Página 101 - Prove that parallelograms on the same base and between the same parallels are equal in area.
Página 35 - Any two sides of a triangle are together greater than the third side.
Página 26 - The lines drawn from the extremities of the base of an isosceles triangle to the middle points of the opposite sides are equal.
Página 70 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Página 85 - The locus of a point at a given distance from a given point is the circumference described from the point with the given distance as radius.
Página 42 - If two triangles have the three sides of the one equal to the three sides of the other, each to each, the triangles are congruent.
Página 110 - Iff a straight line be divided into any two parts, four times the rectangle contained by the whole line, and one of the parts, together with the square of the other part, is equal to the square of the straight line which is made up of the whole and that part.