## An Encyclopaedia of Architecture, Historical, Theoretical, and Practical |

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Page 272

... a tangent and chord is Fig . 278 . measured by

BTA ( fig . 273 . ) be a tangent and TD a chord drawn from the point of contact T ;

the angle ATD is measured by

...

... a tangent and chord is Fig . 278 . measured by

**half**the arc of that chord , LetBTA ( fig . 273 . ) be a tangent and TD a chord drawn from the point of contact T ;

the angle ATD is measured by

**half**the arc TFD , and the angle BTD is measured...

Page 273

by

measured by

the side AB opposite to the angle C will be greater than the side AC opposite to ...

by

**half**the arc ADB , is greater than the angle at the circumference B , which ismeasured by

**half**the arc AFC . Again , if the angle C is greater than the angle B ,the side AB opposite to the angle C will be greater than the side AC opposite to ...

Page 298

Now the angle DAE in a semicircle , is a right angle , or AE is perpendicular to AD

; aud DF , parallel to AE , is also perpendicular to AD : therefore AE is the tangent

of CDA the

Now the angle DAE in a semicircle , is a right angle , or AE is perpendicular to AD

; aud DF , parallel to AE , is also perpendicular to AD : therefore AE is the tangent

of CDA the

**half**sum ; and DF , the tangent of DAB , the**half**difference of the ...### What people are saying - Write a review

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angle appears arch architect architecture base beam becomes bricks building built called cathedral centre century church circle colour columns common considered construction contains course covered curve depth describe diameter direction divided draw edifices effect employed equal erected examples experiments extremely face feet figure force four front give given greater half height horizontal houses inches iron Italy joints length less lime material means middle mouldings nearly necessary observed obtained parallel period perpendicular piece placed plane portion practice principal produced Prop proportion quarries radius remains respect Roman roof round says side similar solid square stone strength style supposed surface temple thickness timber tower triangle upper vault vertical walls whereof whole wood