Find the circumference of the circles from their diameters given below.

(1) 3.5 cm

(2) 6.3 m

(3) 0.14 m

(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.