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Sonal Chauhan
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Perimeter of a circle is 2 x π x r, directly proportional to radius r. Therefore, the ratio of circumferences C1 / C2 = (2πr1) / (2πr2) = r1 / r2 = 5 / 4, so ratio of radii is ...

cbse class 9 ganita manjari chapter 6 solutionsncert class 9 ganita manjari chapter 6 question answerratio of the perimeters of two circles is 5:4sample question from class 9 math chapter 6 measuring space: perimeter and areathe ratio of their radii
Kriti
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Using arc length formula (θ / 360) x 2 x π x r gives: (i) (60/360) x 2 x (22/7) x 3.5 = 11/3 = 3.67 cm, and (ii) (120/360) x 2 x (22/7) x 6.3 = 13.2 m.

angle at the centre is 60°length of the arc of a circle if: (i) the radius is 3.5 cmncert class 9 ganita manjari chapter 6 question answerradius is 6.3 m and the angle at the centre is 120°sample question from class 9 math chapter 6 measuring space: perimeter and area