Normal line y=x²-1²-2; (1.-2)

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

What is the volume of the sphere shown below with a radius of 3?

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?