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Find the circumference of circles whose radii are
1. 28 cm
2. 10.5 cm
3. 3.5 cm
Given :
Radii of circles are
i) 28 cm ii) 10.5 cm iii) 3.5 cm
To find :
Circumference of Circle
Solution :
Formula to find the Circumference of Circle = 2πr
i) r = radius = 28 cm
2 π r = $2\times \frac{22}{7} \times28$
= $2\times22\times4$
= 176 cm.
Circumference of the circle with radius 28 cm is 176 cm.
ii) r = radius = 10.5 cm
2 π r = $2\times \frac{22}{7} \times10.5$
= $2\times22\times1.5$
= 66 cm.
Circumference of the circle with radius 10.5 cm is 66 cm.
iii) r = radius = 3.5 cm
2 π r = $2\times \frac{22}{7} \times3.5$
= $2\times\frac{22}{2}$
= 22 cm.
Circumference of the circle with radius 3.5 cm is 22 cm.