Answer:
answers are given below
Step-by-step explanation:
1.
Circumference = [tex]2\pi r[/tex]
Where 2r = Diameter
Hence
Circumference = [tex]\pi \times Diameter[/tex]
2.
No there is no such circle in which relationship between Radius and Diameter can be represented without [tex]\pi[/tex].
This is because while deriving the relation the angle measurement ts taken into consideration and the angle are measured in radians i.e. in terms of [tex]\pi[/tex] not degrees.
3. We can not determine the exact circumference because [tex]\frac{22}{7}[/tex] is a rational number and but its value is approximately taken from [tex]\pi[/tex] and [tex]\pi[/tex] is an irrational number
