Do the ratios
50
27

and
6
3
form a proportion?

No because if you cross multiply 50x3= 150 while 27x6 is like 162 so no

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.