Answer :

(1). Given: Diameter = 3.5 cm


Radius, r = Diameter/2


r = 3.5/2 = 1.75 cm



Circumference of the circle is given by,


Circumference = 2πr


Circumference


Circumference


Hence, circumference is 11 cm.


(2). Given: Diameter = 6.3 m


Radius, r = Diameter/2


r = 6.3/2 = 3.15 m



Circumference of the circle is given by,


Circumference = 2πr


Circumference


Circumference


Hence, circumference is 19.8 cm.


(3). Given: Diameter = 0.14 m


Radius, r = Diameter/2


r = 0.14/2 = 0.07 m



Circumference of the circle is given by,


Circumference = 2πr


Circumference


Circumference


Hence, circumference is 0.44 m.


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