Make sure you are using the correct SI unit on the ruler.
It depends on the type of ruler you are using. Depends if you are using a just metric unit ruler or if you are using a yard/meter stick. The measurements should be written along the edge of the ruler.
a ruler using centimetres as the mesurement
You cannot. You cannot ensure the lines are strictly parallel using only a ruler.
There is a hole in the ruler (i.e.) circle just make the circle using that
It depends on what the ruler's made out of. A plastic ruler would inevitably weigh less than a steel ruler.
No particular precautions have been reported as being necessary in using cyperus.
No necessary precautions to observe in the diet.
It depends on the type of ruler you are using. Depends if you are using a just metric unit ruler or if you are using a yard/meter stick. The measurements should be written along the edge of the ruler.
a ruler using centimetres as the mesurement
You cannot measure an angle using a ruler.
no
You cannot. You cannot ensure the lines are strictly parallel using only a ruler.
There is a hole in the ruler (i.e.) circle just make the circle using that
The uncertainty of a ruler refers to the smallest measurement that can be reliably determined using that ruler. It represents the margin of error in measurements taken with the ruler.
No special precautions are necessary when cuscuta is used in the doses normally prescribed by herbalists.
To record measurements using a ruler, place the ruler next to the object to be measured. Ensure that the zero mark on the ruler aligns with one end of the object. Read the measurement where the other end of the object falls on the ruler and record it in the appropriate units.
the ruler was used to measure the length of my book.