Which sentence uses punctuation correctly? a. the acorn festival, which is held every october, is my favorite event. b. the acorn festival which is held every october is my favorite event. c. the acorn festival which is held every october, is my favorite event.

the formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle. if a circle is tangent to the x-axis at (3,0), this means it touches the x-axis at that point.