Betelgeuse Diameter. Estimate the diameter of the supergiant star Betelgeuse from its angular diameter of 0.05 ­arcsecond and distance of about 600 light-years. Compare your answer to the size of our Sun and the Earth-Sun distance.

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.