## Elements of Geometry and Trigonometry |

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Page 10

The point of

The point of

**intersection**A is the vertex of the angle , and the lines AB , AC , are its sides . A4 B The angle is sometimes designated simply by the letter at the vertex A ; sometimes by the three letters BAC , or CAB , the letter at ... Page 15

... form one and the same straight line . PROPOSITION IV . THEOREM . When two straight lines

... form one and the same straight line . PROPOSITION IV . THEOREM . When two straight lines

**intersect**each other , the opposite or vertical angles , which they form , are equal . Þ Let AB and DE be two straight A lines , BOOK I. 15. Page 16

The four angles formed about a point by two straight lines , which

The four angles formed about a point by two straight lines , which

**intersect**each other , are together equal to four right angles : for the sum of the two angles ACE , ECB , is equal to two right angles ; and the sum of the other two ... Page 17

Hence , the point D , falling at the same time in the two straight lines BA and CA , must fall at their

Hence , the point D , falling at the same time in the two straight lines BA and CA , must fall at their

**intersection**A : hence , the two triangles EDF , BAC , coincide with each other , and are therefore equal ( Ax . 13. ) . A Cor . Page 49

If two circles cut each other in two points , the line which passes through their centres , will be perpendicular to the chord which joins the points of

If two circles cut each other in two points , the line which passes through their centres , will be perpendicular to the chord which joins the points of

**intersection**, and will divide it into two equal parts .### What people are saying - Write a review

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### Common terms and phrases

ABCD adjacent altitude base become Book called centre chord circle circumference circumscribed common cone consequently contained Cosine Cotang cylinder described determine diameter difference distance divided draw drawn equal equations equivalent expressed extremities faces feet figure follows formed four frustum give given gles greater half hence homologous hypothenuse included inscribed intersection less let fall logarithm manner means measured meet middle multiplied number of sides opposite parallel parallelogram pass perpendicular plane polygon prism PROBLEM Prop proportional PROPOSITION pyramid quadrant quantities radii radius ratio reason rectangle regular remaining right angles Scholium segment sides similar Sine solid solid angle sphere spherical triangle square straight line suppose taken Tang tangent THEOREM third triangle triangle ABC unit vertex whole