Answer:
Explanation:
1). Let the circumference C and area A of the circle are proportional,
C ∝ A
C = kA
Here k = proportionality constant
k =

From the given table,
For C = 25 cm, A = 50 cm²
Then the value of k =
k =

For C = 50 cm, A = 201 cm²
k =
≈

In both the cases proportionality constant is giving the different values.
Therefore, Circumference and Area of the circular objects are not proportional.
2). If A =

Then this equation will be true for all the values of r and C given in the table.
For r = 4 cm and C = 25 cm
A =
= 50 cm²
For r = 8 cm and C = 50 cm
A =

A = 200 cm²
True for all values of 'r' and 'C'.