Question

Write the following statements using the
(1) Circumference (c) of a circle is directly proportional to its radius (r).​

Answer 1

$\huge\mathscr\colorbox{skyblue}{\color{black}{AnSwEr~↓~↓~}}$

That is, the circumference of a circle is proportional to its radius, R; double R and you double C. The factor '2 pi' is simply the constant of proportionality between C and R. So the area of a circle is proportional to R2 and pi is the constant of proportionality between the area and the radius of a circle.