Find the point on the sphere (x (5)2 + y2 + (z + 7)2 = 4 nearest to a. the xy-plane. b. the point ( - 9,0, - 7). a. The point on the sphere nearest the xy-plane is (D, D, D). Find the perimeter of the triangle with vertices A( - 3,3,1), B(2, - 3,1), and C(5,7,2). The perimeter is D units. (Type an exact answer, using radicals as needed.) Give a geometric description of the set of points in space whose coordinates satisfy the given pair of equations. )(2 + 22 = 49, y = 2 Choose the correct description. 0 A- The ellipse formed by the intersection of the cylinder x2 + 22 = 49 and the yzplane O B- The ellipse formed by the intersection of the cylinder x2 + 22 = 49 and the plane y = z O C. The circle with center (0,0,0) and radius 7 in the yz-plane O D. The circle with center (0,0,0) and radius 7 in the plane y =z