Please help if Yk the answer.

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

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take