What is the volume of a sphere with a great circle that has an area of 224 pi centimeter squared?

What is the measure of angle z in this figure? enter your answer in the box. z = ° two intersection lines. all four angles formed by the intersecting lines are labeled. clockwise, the angles are labeled 43 degrees, x degrees, y degrees, and z degrees.

Measures of the angle of r, 31 s (x+4) t (3x+9)

I’m confused on how to work the pie charts