Plane Geometry |
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Page 35
... triangles ABC and DEF , let AB be equal to DE , AC to DF , and the angle A to the angle D. To prove that AABC = ADEF . Proof . Apply ... given two angles and the included side , in § 143 two sides and the included ... triangle TRIANGLES . 35.
... triangles ABC and DEF , let AB be equal to DE , AC to DF , and the angle A to the angle D. To prove that AABC = ADEF . Proof . Apply ... given two angles and the included side , in § 143 two sides and the included ... triangle TRIANGLES . 35.
Page 63
... triangles are equal . 18. State the cases in which two right triangles are equal . 19. What is meant by a locus of points ? 20. Where are the points located in a plane that are each equidistant from two given points ? from two ...
... triangles are equal . 18. State the cases in which two right triangles are equal . 19. What is meant by a locus of points ? 20. Where are the points located in a plane that are each equidistant from two given points ? from two ...
Page 64
... given , and consists in putting together known truths in order to obtain a new truth . The analytic method is the ... triangles ; or legs of an isosceles triangle ; or opposite sides of a parallelogram . Two angles are proved equal by ...
... given , and consists in putting together known truths in order to obtain a new truth . The analytic method is the ... triangles ; or legs of an isosceles triangle ; or opposite sides of a parallelogram . Two angles are proved equal by ...
Page 66
... triangle is equidistant from the three vertices . From D , the middle point ... triangles have two sides of the one equal , respectively , to two sides of the ... given angles B and B ' are both right or both obtuse angles . 2. If the ...
... triangle is equidistant from the three vertices . From D , the middle point ... triangles have two sides of the one equal , respectively , to two sides of the ... given angles B and B ' are both right or both obtuse angles . 2. If the ...
Page 68
... given angle . E * * * * E A B A B Ex . 29. The bisectors of two supplementary adjacent angles are per- pendicular to ... triangle bisects the base , and is perpendicular to the base . AADCA BDC ( § 143 ) . Ex . 35. The perpendicular bisector ...
... given angle . E * * * * E A B A B Ex . 29. The bisectors of two supplementary adjacent angles are per- pendicular to ... triangle bisects the base , and is perpendicular to the base . AADCA BDC ( § 143 ) . Ex . 35. The perpendicular bisector ...
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Common terms and phrases
AB² ABCD AC² acute angle adjacent angles altitude angles are equal apothem arc A'B base bisector bisects called centre chord circumference circumscribed circle coincide decagon diagonals diameter divide Draw equal circles equiangular equiangular polygon equidistant equilateral triangle exterior angle feet Find the area Find the locus given angle given circle given line given point given straight line given triangle greater Hence homologous sides hypotenuse inches inscribed regular intercepted intersecting isosceles trapezoid isosceles triangle legs limit line drawn median middle point number of sides parallelogram perimeter perpendicular plane PROBLEM Proof prove Q. E. D. PROPOSITION quadrilateral radii radius ratio rectangle regular hexagon regular inscribed regular polygon rhombus right angle right triangle secant segments straight angle supplementary tangent THEOREM third side trapezoid triangle ABC triangle is equal variable vertex
Popular passages
Page 33 - The sum of two sides of a triangle is greater than the third side, and their difference is less than the third side.
Page 150 - If two triangles have an angle of the one equal to an angle of the other, and the including sides proportional, they are similar. In the triangles ABC and A'B'C', let ZA = Z A', and let AB : A'B' = AC : A'C'. To prove that the A ABC and A'B'C
Page 66 - If two triangles have two sides of the one equal respectively to two sides of the other, but the included angle of the first greater than the included angle of the second, then the third side of the first is greater than the third side of the second. Given A ABC and A'B'C...
Page 191 - The areas of two triangles which have an angle of the one equal to an angle of the other are to each other as the products of the sides including the equal angles. To prove that Proof. A Let the triangles ABC and ADE have the common angle A. A ABC -AB X AC Now and A ADE AD X AE Draw BE.
Page 169 - In any triangle the product of two sides is equal to the product of the diameter of the circumscribed circle by the altitude upon the third side.
Page 32 - After remarking that the mathematician positively knows that the sum of the three angles of a triangle is equal to two right angles...
Page 71 - The sum of the perpendiculars dropped from any point within an equilateral triangle to the three sides is constant, and equal to the altitude.
Page 156 - In a series of equal ratios, the sum of the antecedents is to the sum of the consequents as any antecedent is to its consequent.
Page 75 - PERIPHERY of a circle is its entire bounding line ; or it is a curved line, all points of which are equally distant from a point within called the centre.
Page 162 - The sum of the squares of the two legs of a right triangle is equal to the square of the hypotenuse.