## Elements of Geometry and Trigonometry |

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Page 10

When two straight lines , AB , AC ,

When two straight lines , AB , AC ,

**meet**each other , their inclination or opening is called an angle , which is greater or less as the lines are more or less inclined or opened . The point of intersection A is the vertex of the angle ... Page 14

If one straight line

If one straight line

**meet**another straight line , the sum of the two adjacent angles will be equal to two right angles . E Let the straight line DC**meet**the straight line AB at C , then will the angle ACD + the angle DCB , be equal to ... Page 15

If a straight line

If a straight line

**meet**two other straight lines at a common point , making the sum of the two adjacent angles equal to two right angles , the two straight lines which are met , will form one and the same straight line . Page 16

A In general , if any number of straight lines CA , CB , CD , & c .

A In general , if any number of straight lines CA , CB , CD , & c .

**meet**in a point C , the sum of all the successive angles ACB , BCD , DCE , ECF , FCA , will be equal to four right angles : for , if four right angles were formed about ...### What people are saying - Write a review

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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