A(n) is a closed shape made up of points that are the same distance from a fixed point called the center. circle arc radius diameter

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Asphere has a diameter of 10 in. what is the volume of the sphere?