First, find the midpoint of the diameter. the midpoint is the center of the circle. [(-10+(-6)]/2=-8, [(-8+(-2)]/2=-5 so the center is at (-8, -5) next, find the distance between the two points: d=√[-6-(-10)]²+[-2-(-8)]²=√4²+6²=√52=2√13 half of the diameter is radius, r=half of 2√13=√13 standard equation for the circle is (x-h)²+(y-k)²=r², (h,k) being the center, r the radius (x+8)²+(y+5)²=13 is the answer.
