A room of 1728 m3 volume is shown by a cube of 216 cm3 volume. Find the RF & Construct a plain scale to measure up to 42 m. Mark a distance of 22m on this scale

 A room of 1728 m3 volume is shown by a cube of 216 cm3 volume. Find the RF &    Construct a plain scale to measure up to 42 m. Mark a distance of 22m on this scale 
 Sol) Given data: 

 RF                =     3  (216) cm3/ (1728 x (100)3) cm3 

 = 1/200.

 Max Length (ML) = 42 m (6 x 7 or 7 x 6);     LOS is divided into 6 parts of 7 m each or 7 parts of 6 m each


Length of scale (LOS) = RF X ML (in cm)     = (1/200) x 42 x 100 cm (1 m=100cm)     = 21cm.

The length of the line that is drawn on the drawing sheet is 21 cm.

The sub scale is to be divided into 6 or 7 parts.


The length to be shown is 22 m = 18 m (on main scale) + 4 m (on sub scale)