Draw concentric circle for the following measurements of radii

Draw concentric circle for the following measurements of radii/diameters. Find out the width of the circular ring. r = 5 cm and r = 7.5 cm

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Draw three concentric circles of radii 1.5 centimeter, 2.5 centimeter and 3.5 centimeter with O as centre.

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If the radii of two concentric circles are 4 cm and 5 cm, then how do you find the length of each chord of one circle which is tangent to the other