Question

I do not know what this is

Answer 1

I can't really see it, but is the scale is 1 to 50 divide the really length by 50 to get the measure measure of here drawing

so if the room is 10 by 20 meters

10 is 1000 cm

1000/50 = 20 cm

20 is 2000 cm

2000/50 = 40 cm

then the drawing of that room is 20cm by 40cm