Elements of Geometry and Trigonometry |
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Page 30
Adrien Marie Legendre Charles Davies. Cor . 2. If two angles of one triangle are ... triangle have more than one obtuse angle . Cor . 4. In every right angled ... ABC , the exterior angle BAD is equal to the sum of the two interior ...
Adrien Marie Legendre Charles Davies. Cor . 2. If two angles of one triangle are ... triangle have more than one obtuse angle . Cor . 4. In every right angled ... ABC , the exterior angle BAD is equal to the sum of the two interior ...
Page 33
... A B C For , draw the diagonal DB , dividing the quadrilateral into two triangles . Then , since AB is parallel to DC ... triangle DBC ( Prop . V. ) ; therefore , the side AD is equal to BC , the angle ADB DBC , and conse- quently AD is ...
... A B C For , draw the diagonal DB , dividing the quadrilateral into two triangles . Then , since AB is parallel to DC ... triangle DBC ( Prop . V. ) ; therefore , the side AD is equal to BC , the angle ADB DBC , and conse- quently AD is ...
Page 54
... triangle ABC , is equal to the sum of the two interior angles CAB , ABC ( Book I. B Prop . XXV . Cor . 6. ) : but the triangle BAC being isosceles , the angle CAB is equal to ABC ; hence the angle BCE is double of BAC . Since BCE lies ...
... triangle ABC , is equal to the sum of the two interior angles CAB , ABC ( Book I. B Prop . XXV . Cor . 6. ) : but the triangle BAC being isosceles , the angle CAB is equal to ABC ; hence the angle BCE is double of BAC . Since BCE lies ...
Page 63
... triangle ABC shall be inscribed . PROBLEM XIV . Through a given point , to draw BOOK III . 63.
... triangle ABC shall be inscribed . PROBLEM XIV . Through a given point , to draw BOOK III . 63.
Page 64
... triangle . Let ABC be the given triangle . Bisect the angles A and B , by the lines AO and BO , meeting in the point 0 ; from the point O , let fall the perpendiculars OD , OE , OF , on the three sides of the triangle : these ...
... triangle . Let ABC be the given triangle . Bisect the angles A and B , by the lines AO and BO , meeting in the point 0 ; from the point O , let fall the perpendiculars OD , OE , OF , on the three sides of the triangle : these ...
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Common terms and phrases
adjacent adjacent angles altitude angle ACB angle BAC ar.-comp base multiplied bisect Book centre chord circ circumference circumscribed common cone convex surface Cosine Cotang cylinder diagonal diameter dicular distance draw drawn equal angles equally distant equiangular equivalent figure formed four right angles frustum given angle given line gles greater homologous sides hypothenuse inscribed polygon intersection less Let ABC let fall logarithm measured by half number of sides oblique lines opposite parallelogram parallelopipedon pendicular perimeter perpen perpendicular plane MN polyedron polygon ABCDE prism proportional PROPOSITION pyramid quadrant quadrilateral quantities radii radius ratio rectangle regular polygon right angled triangle S-ABC Scholium secant secant line segment side BC similar sine solid angle solid described sphere spherical polygon spherical triangle square described straight line tang tangent THEOREM triangle ABC triangular prism vertex