Scale DrawingsMeasure lines on a drawingReduce and Enlarge a drawingA scale drawing is a drawing of an object with dimensions proportional to those of the actual object.To fnd lengths from scale drawings, set up and solve ratio and proportions.Adrawingthatshows a real objectwith accurate sizes except theyhave all been reduced or enlargedby a certain amount (called the scale).Example:thisdrawinghas ascaleo"1:10",so anythingdrawnwiththe sizeo"1"wouldhavea sizeo"10"inthereal world! so a measurement o 150mmonthedrawing wouldbe1500mmonthe real horseSince it is not always possible to draw on paper the actual size of real-life objects such as the real size of a car, or an airplane, we need scale drawings to represent the size lie the one you see below of a van.!n real-life, the length of this van may measure " metres. #aper length less than $% cm - needs &% sheetsTo use just one sheet,- ' cm drawing to represent &% cm on the real object(ou can write this situation as ')&% or '*&% or ' to &%Notice : "irst number reers to the length o the drawing on paper and the second number reers to the length o real objectExample:Suppose that the length of the vehicle is drawn to scale - ')&% and measures $% cm on paper.#et x be the real length o the vehicle.$he length o the drawing is %& cm%& x '& ( )*ence the length o the vehicle is +&&cm or + m.) ( +&& cmScale factors* +atio ,hen we draw maps or plans we use a scale so that we can ft a large area on a small amount of paper.. A scale factor reduces or enlarges a shape -such that while it is made bigger or smaller. its proportions remain the same./nlarging by a scale factorThe size is increased#roportionally e0ual$he tric, with ratios is to always multiply the numbers in the ratio by the same value.Ex- 4 : 5 is same as 4.' : 5.' =: 101rawing to Scale ,hen architects draw up plans they use a scale, e2 ')'%% This means - 'cm on the drawing represents '%%cm in real life Scales allow architects to draw accurate 3oor plans 1rawing to scale is easy4 /ouble0glazed windowsdoor