## 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 call- ed 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 . Let the straight line DC**meet**the straight line AB at C , then will the angle ACD + the angle DCB , be equal to two ... 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 twó right angles , the two straight lines which are met , will form one and the same straight line . Page 16

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

B 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 construction contained corresponding cosine Cotang cylinder described diameter difference distance divided draw drawn equal equation equivalent evident expressed extremities fall figure follows formed formulas four frustum give given gles greater half hence homologous included inscribed intersection less likewise logarithm manner means measured meet middle multiplied opposite parallel parallelogram parallelopipedon pass perpendicular plane polygon prism PROBLEM Prop proportional PROPOSITION pyramid quantities radii radius ratio reason rectangle regular remaining right angles Scholium segment shown sides similar sine solid solid angle sphere spherical triangle square straight line Suppose surface taken tang tangent THEOREM third triangle triangle ABC vertex whole