Question

# Find the circumference of a circle whose diameter is (i) 14 cm (ii) 35 cm (iii) 10.5 m

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Solution

## (i)Circumference=2πr =π(2r)=π× Diameter of the circle (d) (Since, Diameter=2×radius)⇒Circumference=Diameter×π Diameter of the given circle is 14 cm. Circumference of the given circle=14×π =14×227=44 cmTherefore, Circumference of the given circle is 44 cm.(ii)Circumference=2πr=π(2r) =π×Diameter of the circle(d) As (Diameter=2×Radius)⇒Circumference=Diameter×π Diameter of the given circle is 35 cm. ⇒Circumference of the given circle=35×π ⇒35×227=110 cmTherefore, circumference of the given circle is 110 cm.(iii)Circumference=2πr =π(2r) =π×Diameter of the circle(d) as (Diameter=2×Radius)⇒Circumference=Diameter×π Diameter of the given circle is 10.5 m. Circumference of the given circle=10.5×π ⇒10.5×227=33 m Circumference of the given circle is 33 m.

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