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The answere is so simple. You can see your 1 and 2 part from google or you can see on topper asking.
Hope it will be helpful for you.
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Answer:
the volume of cylinder = πr²h
π =3.14
(a) π = 3.14 , r = 7 cm , h = 10 cm
= 3.14 × 7² × 10
= 31.4 × 49
= 1538.6 cm
(b) π =3.14 , r =15 cm , h = 12 cm
= 3.14 × 15² × 12
= 37.68 × 225
= 8478
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