Could someone please help and explain this - Biology AS levelWatch
Whole graticule is 12/100 X 10 mm = 12/10 = 1.2 mm
You can see that the cell spans 30 divisions i.e. 3/10ths of whole graticule, yeah?
So the size of cell [if 100 out of the whole represents 1.2 mm, how much will 30 represent?]
= 30/100 X 1.2 = 0.36 mm = 360 um [micrometres - you use the Greek lower case "mu" to mean micro, but TSR has no option to type Greek letters, so I am using "u" instead].