It has infinite length and zero measure in any other direction.
yes they do, to measure and calculate how much paint they need, they also use maths to estimate something
you have to measure how much medicine you are going to give a patient
The measure of how much a ray of light bends when it enters the material is called the index of refraction.
a ray in maths is a arm of an angle.
mm
In maths, a ray.
ray rad[ian]
Index of refraction
This is called refraction.
cm
Index of Refraction
Ml is mili litre in maths. It is used to measure the quantity of a liquid. For eg , there is 100ml of water in this glass.