Question

As the diameter (d) of a circle increases in size, the circumference (C)

increases Likewise, as the diameter decreases in size, so does the circumference,
The constant of variation between Cand dist. Describe the kind of variation
between eireumference and diameter Write the equation.

Answer 1

When one quantity increases in proportion to the other, it is said to be directly proportional.
The equation of direct proportion is y=kx, where is the constant of proportionality. When we input variables c (circumference) and d (diameter), we can write the equation as c=kd / d=kc