Ex 6.1, 8

Last updated at May 29, 2026 by

The ratio of the perimeters of two circles is 5:4. What is the ratio - Exercise Set 6.1

part 2 - Ex 6.1, 8 - Exercise Set 6.1 - Chapter 6 Class 9 - Measuring Space: Perimeter and Area (Ganita Manjar - Class 9

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Ex 6.1, 8 The ratio of the perimeters of two circles is 5:4. What is the ratio of their radii? Let the radius of two circles be 𝒓_𝟏 and 𝒓_𝟐 Given that ratio of the perimeters of two circles is 5:4 So, we can write (π‘ƒπ‘’π‘Ÿπ‘–π‘šπ‘’π‘‘π‘’π‘Ÿ π‘œπ‘“ πΆπ‘–π‘Ÿπ‘π‘™π‘’ 1)/(π‘ƒπ‘’π‘Ÿπ‘–π‘šπ‘’π‘‘π‘’π‘Ÿ π‘œπ‘“ πΆπ‘–π‘Ÿπ‘π‘™π‘’ 2)=5/4 (πΆπ‘–π‘Ÿπ‘π‘’π‘šπ‘“π‘’π‘Ÿπ‘’π‘›π‘π‘’ π‘œπ‘“ πΆπ‘–π‘Ÿπ‘π‘™π‘’ 1)/(πΆπ‘–π‘Ÿπ‘π‘’π‘šπ‘“π‘’π‘Ÿπ‘’π‘›π‘π‘’ π‘œπ‘“ πΆπ‘–π‘Ÿπ‘π‘™π‘’ 2)=5/4 (2πœ‹π‘Ÿ_1)/(2πœ‹π‘Ÿ_2 )=5/4 𝒓_𝟏/𝒓_𝟐 =πŸ“/πŸ’ Thus, ratio of their radii is also 5: 4

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