They use a complicated kind of trigonometry, looking at the apparent distance, light, and other different factors to calculate it.
Answer #1:no=================Answer #2:Yes.Another answer: The primary use of triangulation may not be to measure the distance of stars, but the method which is used to measure the distance of close stars is primarily triangulation.
To measure the distance of stars you have to measure by light years.
light years
A light year is a measure of how far light can travel in one year. It is a phenomenal distance, and is used to describe how far away stars are from us.
The appliance of science
Distance.
Scientists measure light from star in light years because almost every other units would be so small compared to the distance involved between stars. in fact the nearest star (other then the sun) is 24689699219682.054 miles or 39734219301000 km.
You can measure it by using absolute magnitude.
light years
With a long measuring tape.
Light Years.
It depends on what you want to measure: their numbers, distance, mass, temperature, ...