As we know that we cannot draw the fixed shape and size of very small or very big figure on the sheet of paper . It is very difficult to show distances lengths or breath which are too big to draw full size . To draw the figure in the figure in the paper we can just reduce their actual size and for a small figure , we should enlarge their actual size in drawing by taking a scale . A scale drawing is defined as a drawing that shows the size of an object into the form which may be reduction or enlargement .
Scale Factor:
The scale of the drawing is the ratio of the size of the picture or figure to the same size of the objects. For example :
Scale : 1cm to 1km ( or ,1:100000)
Scale drawing .
The scale of a drawing is called scale factor . It is used to break (reduce) or increase (enlarge ) a figure according to the scale ratio.
Bearing:
You can see the adjoining compass and learn the different direction . Whereas in the compass NOS shows North-South and EOW show East - West direction . In the angle between N and E is 90^{o}. Whereas the direction NE lies between N and E . The angle between N and NE is 45^{o}. O is taken as the point of reference and ON as a base to find the direction of any place in degrees measuring clockwise from the baseline ( NO ) . The direction is usually written using three digits for example :
The direction in which one object or place is sighted may be specified by giving the angle in degrees that the direction makes with the north line is called the bearing if the object. Usually, the bearing of an object or place is written in three digits . So , it is also called three digit bearing.
Solution:
Here, the scale 1:500000 means, 1 cm represents 500000 cm = \(\frac{500000}{100}\) m = 5000 m = 5 km
Now, 1 cm represents 5 km
\(\therefore\) 3.2 represents 3.2 × 5 km = 16 km
So, the distance between two places is 16 km.
Solution:
Solution:
Here, bearing of A from B is 075°
Since, BN//AN, \(\angle\)NBA and \(\angle\)N_{1}AB are co-interior angles.
\(\therefore\) \(\angle\) N_{1}AB = 180° - 75° [Co-interior angles are supplementary.]
= 105°
\(\therefore\) Bearing of B from A = 360° - 105° = 255°.
What is the actual length which is represented by 3.6 cm on a scale drawing with the scale of 1 cm to 4 m?
If 1 cm represents 5 m, what is the scale drawing length of 24 m?.
What is the actual length which is represented by 2.5 cm on a scale drawing with scale of 1 cm to 5 m(or 1 : 500)?
The scale of a drawing is also known as the ______ .
A rectangular hall is 25 m long and 18 m board. If the map scale is 1:500, what are the length and breadth of the room on drawing?
ASK ANY QUESTION ON Scale Drawing and Bearing
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