1.

Find the circumference of the circles whose radii are given below. (i) 49 cm (ii) 91 mm

Answer»

(i) Radius r = 49 cm 

Circumference C = 2 πr units 

= 2 x \(\frac{22}{7}\) x 49 

= 2 x 22 x 7 

= 44 x 7 

= 308 cm

(ii) Radius r = 91 mm 

Circumference C = 2 πr units 

= 2 x \(\frac{22}{7}\) x 91

= 2 x 22 x 13 

= 44 x 13 

= 572 mm



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