Those who will answer my question correctly, I will mark themselves as brainliest otherwise I will report them and I have a hack to terminate thier ID also, so please answer me correctly.
It is in the attachment
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r = radius of the cylinder
h = height of the cylinder
Area of the curved surface of the cylinder = 2πrh
Area of the total surface of the cylinder = 2πr(h+r)
Area of the circular surface of the cylinder = 2πr²
therefore;
1) At r = 7cm
Area = 2×(22/7)×7×7
=308cm²
2) At r = 3.5cm= 7/2cm
Area = 2×(22/7)×(7/2)×(7/2)
= 77cm²
3) At r = 14cm
Area = 2×(22/7)×14×14
= 176cm²
4) At r = 21cm
Area = 2×(22/7)×21×21
= 1386cm²
5) At r =2.8cm
Area = 2×(22/7)×2.8×2,8
= 49.28cm²
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