The diameter of a sphere is: a) a chord that passes through the center of the sphere b) a fixed point equidistant from all points on the surface of the sphere c) a line segment from the center point to a point on the sphere d) a three-dimensional circle in which all points are equidistant from a fixed point

answer: i'm not going to give you the answer, but some hints to work it out.

step-by-step explanation: so, if there is a straight line that means that the line angle is 180°. so we subtract the 2 angle measures provided, (15 and 38) from 180. so the answer is 180 - (38 + 15). (you have to solve the equation)