plz solve this.....its very urgent....❤️❤️❤️❤️
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volume of hollow cylinder = Volume of solid cylinder
=> π h [ r1² - r2²] = π r²h
=> π h [ 21²-14²] = π r² × 21
=> 15 × 245 = r² × 21
=> r² = 175
=> r = 13.22 cm
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