Question

Circumference of circle is proportional to diameter of circle where the constant of proportionality is.

• A. $\pi$
• B. 3.16
• C. $2\pi$

Answer 1

The correct option is A $\pi$

Circumference of the circle = $\pi \times$Diameter of the circle

If $y=kx$ then $y$ is directly proportional to $x$ and $k$ is constant of proportionality.
Here, $\pi$ is constant of proportionality as circumference is proportional to diameter.