What is meant by #theta# in a polar coordinate formula?

Related questions

• What are polar coordinates used for in real life?
• How do I graph polar coordinates?
• How do I use polar coordinates to find the volume of a sphere of radius #r#?
• What is spherical polar coordinate system?
• What is meant by #tan^(-1)(y/x)# in a polar coordinate formula?
• What is a polar plot?
• Is an angle measured clockwise or counterclockwise in the polar coordinate system?
• Write the complex number #sqrt3 - i# in polar form?
• How do you plot the polar coordinate (3, -7pi/6)?
• Are the two polar coordinates the same: (8, pi/3), (-8, -pi/3)?