Is latitude measured in miles? true or false?

Latitude can't be measured in miles, because it's not a distance. 
If you see or hear the statement that "latitude is measured in miles",
that statement is false.

Latitude is an angle.  The only proper way to describe a latitude is in units
of angle.  Angle units include radians, grads, etc.  By far the most common
angle units used to describe latitude are degrees, minutes, and seconds.