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15-08-2020
Mathematics

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16-08-2020

Step-by-step explanation:

v= crossectional area × height

use the formular to find the answer

490= πr²× h

490= 22/7 × 7×7×h

490= 22/7×49h

490= 154h { divide}

h = 3.18cm , it is a recurring decimal 3.18181818181..

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