An inscribed  angle has a measure of 64O. What is the measure of the central angle that subtends it?

A regular tiling can be made up of regular heptagons.

Consider an ellipse with a horizontal axis of 20 and a vertical axis of 10. When  , what does   equal? Round your answer to one decimal place and enter just the numeric value below. 

Consider an ellipse with a horizontal axis of 10 and a vertical axis of 20. Which of the following is the equation of this ellipse? 

Consider an ellipse with a horizontal axis of 10 and a vertical axis of 20. When  , what does   equal? Round your answer to one decimal place and enter just the numeric value below. 

An inscribed  angle has a measure of 82O. What is the measure of the central angle that subtends it?

A regular tiling can be made with regular hexagons.

Consider a circle with a radius of r = 5 in and a central angle of 120O. What is the arc length created by this central angle? Write your as a fraction in simplest form, leaving

An inscribed angle has a measure of 42O. What is the measure of the central angle that subtends it?

Convert 40.1o to degrees, minutes and seconds.