1) The interior angles of an equilateral triangle are all 60 degrees.
2a) A leap year contains 366 days. The Earth turns on its axis in 1 day. So we have 366 complete revolutions. What is this angle?
2b) The Earth rotates through 360 degrees every 24 hours. What fraction of 360 is 150? So how many hours does it take?
2c) Same as 2b) except now the Earth rotates radians every 24 hours.
3a) A watch hand goes a full circle in 60 seconds. So 1 second is what part of a full circle?
3b) Just convert your answer from 3a) to radians.