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

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Page 266

If a line be perpendicular to one of two

the other . Let AB , CD ( fig . 247 . ) be two

right angles with CD , it will also make right angles with AB . Take at pleasure GC

...

If a line be perpendicular to one of two

**parallel**lines , it is also per . pendicular tothe other . Let AB , CD ( fig . 247 . ) be two

**parallel**lines : if the line FG makesright angles with CD , it will also make right angles with AB . Take at pleasure GC

...

Page 267

251 .

four angles being right angles . In the triangles GLF , FMG the sides LF , GM are

equal , because they are opposite sides of the same rectangle ; the sides LG , FM

...

251 .

**parallel**line GD . Whence the quadrilateral figure GLFM is a rectangle , itsfour angles being right angles . In the triangles GLF , FMG the sides LF , GM are

equal , because they are opposite sides of the same rectangle ; the sides LG , FM

...

Page 269

Parallelograms which are between the same

, are equal . Let the two parallelograms ABCD , AFGD ( fig . 261 . ) , be between

the same

Parallelograms which are between the same

**parallels**, and have the same base, are equal . Let the two parallelograms ABCD , AFGD ( fig . 261 . ) , be between

the same

**parallels**BG , AM , and upon the same base AD ; the space enclosed ...### What people are saying - Write a review

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angle appears arch architect architecture base beam becomes bricks building built called cast 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 horizontal houses inches iron Italy joints length less lime material means mouldings nearly necessary observed obtained original parallel period perpendicular piece placed plane plates 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 weight whereof whole wood