Because otherwise, it wouldn't fit on the paper.
The answer depends on what aspect of the scale drawing you wish to calculate.
# is the ratio of the demensions in the drawing to the corresponding actual dimensions. The scale factor for a scale drawing is the ratio of the dimensions in the drawing to the corresponding acual bimensions.
Not all drawings are done to scale, sketches of buildings and people for instance. However if it is a technical drawing the draughtsman/woman will state on the drawing the scale used.
a scale drawing.
The scale drawing in math is fun. You have to know the challenge level of the basic Mathematics.
Drawing to scale means to draw real objects in their accurate sizes except they are reduced. A house plan is a common item that is drawn to scale. Model cars are another example of drawing to scale. The item is in proportion but smaller.
Scale is how much smaller(or bigger) the drawing is compared to the real object. It'd be real awkward if you were drawing a house to have to make the drawing as big as the house would be. But for the drawing to work out you need to know how to translate between the drawing and reality - so you decide something. Scale 1:12 for instance would mean that something that's one inch in the drawing would be one foot in reality.
It shows how it relates to the actual house. Without scale, you would need as much paper as there is house. Example: a 30 foot house with the scale of 30:1 would be drawn as being 1 foot tall.
The answer depends on what aspect of the scale drawing you wish to calculate.
It shows the constant of proportionality between the scale drawing and the real-life object.
it depends of the scale of the drawing
# is the ratio of the demensions in the drawing to the corresponding actual dimensions. The scale factor for a scale drawing is the ratio of the dimensions in the drawing to the corresponding acual bimensions.
scale questions
Not all drawings are done to scale, sketches of buildings and people for instance. However if it is a technical drawing the draughtsman/woman will state on the drawing the scale used.
a scale drawing.
A drawing of the object in scale.
The scale factor of a scale drawing is the ratio of any length in the drawing to the true corresponding length in the "real" object.