Question

Can anyone explain me what a Parsec is?
And please explain the above given portion. Please please, it would be of great help ​

Answer 1

Explanation:

a unit of distance used in astronomy equal to about3.26 light years

Answer 2

Explanation:

when you calculating parsec arc length is formed which is equal to 1AU i.e 1.496×10^11m. Actually in geometry when arc length is formed simultaneously angle in radian also formed. Just remember value of radian is pi/180°.Now 1 parsec =arc length/ angle in radian. so parsec = 1.496×10^11m/pi÷180. but according to definition the angle Will be in 1 second. so parsec =1.496×10^11m/ pi÷180×1/3600.