What is the value of a?

are you talking about letter a??

Show the picture when you post it we'll go check it out on your page.

the barter

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.